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Hi, I have been searching on the forum in search of some information on MicroSD cards and came to no avail.
With my HD, it came with a 8GB Class 6 MicroSDHC. I think it needed it to play videos. I can't imagine using it with a slower card.
Now, my TP2 will arrive Monday and I would like to know the following:
1. Brand
2. Size
3. Speed (class)
4. Price
Is it performing well with the video playbacks or have you installed the SD Tuner software available for the HD?
What do you recommend?
Many, many thanks for any replies, comments and help!
Bought a A-Data microSD class 6, 4 GB at a local computer store.
Not the one i was looking for, i wanted the 8GB or 16GB but both where not in stock and the 4GB was less then 10 euros. I will buy a larger one in a few months.
With class 6 my phone isn't slowed down. A few years ago i bought a 2GB mini-SD, but my HTC Vox was slowed down very much. Didn't look to the class/or speed back then.
MicroSD cards based on SLC might be beter them MLC. IMHO i would always take a class 6 or higher card. However class 8 cards are hard to find.
I'm using the 8GB Class 4 card that came with my daughter's Nokia 5800 and it seems fine. Just watched an xdiv episode of Only Fools and Horses on it with no stutter or dropped frames.
I bought a class 6 off Ebay and it should be here on Monday so I can compare then
i'm using sandisk 8g class 2. whatched movies and played music, everything is fine. It only cost me just under tenner.
The performance diference between a class 2 or a class 6 is not that noticeable. However, at the price the cards are, I think it worths always to buy a class 6 card.
I bought a Transcend 8GB class 6 card. It cost me aprox. 20€.
The biggest differences I noticed between a class 2 and 6 card are:
-Taking photos is faster with class 6
-Browsing photos in sdcard is a bit faster also
-Viewing movies sometimes is a bit more smooth.
HastaSSSS
I have a 16GB class 2 Sandisk. I watch movies just fine. I figure with a class 6 i might be able to watch HD videos more smoothly.
Hi guys,
Thanks for all your replies. So from what you guys are telling me, it is always better to pay that little extra for the class 6 MicroSDs. But then again, is it worth investing in a 16GB Class 4 (no Class 6 available except the brand A-Data) or an 8GB Class 6.
16GB is nearly 4 times more expensive than the 8GB and yet it is slower. Shall I just get 2 8GB and hot swap the 2 cards as need be?
I bought a class 6 off Ebay and it should be here on Monday so I can compare then
Click to expand...
Click to collapse
Yeah, please let us know if it makes that much of a difference.
Bought a A-Data microSD class 6, 4 GB at a local computer store.
Click to expand...
Click to collapse
I have read about this brand, and what others said was that their Class 6 under performs Sandisk's Class 4 Cards. Do yo notice any differences? How is the performance?
Also, I wouldn't recommend buying these cards off eBay. There are so many, fake cards on there. I know so, because I know mates that sell these cards. I would just buy from a genuine local store and pay a little bit more unless you don't care about performance.
Anyway, my last question.
What brand do you think has the best performance. Yeah, we can find out all the data about these cards on the web but it's nothing like the hands on tests from real users. So, will it be Sandisk, Transend, Toshiba, Kingston or the later A-Data?
Found a pretty review on the Sandisk 16GB C4 MicroSDHC cards. They compared it to the Kingston 8GB C4 MicroSDHC card.
Sandisk seems to be the company that is producing the fastest cards. It out performs Kingston.
But $133, is a bit steep. I think if I am correct a Sandisk 8GB C6 MicroSDHC is only $49.
What do you think?
You won't notice much difference between class 2 and class 6 as the device can only read at a certain speed, which is nearer class 4.
There are some cheap class 2 16gb cards out there, I have them and you only really notice if you install something like sdtuneup, but then again, you wouldn't notice much difference between class4 and class6
SanDisk microSDHC 16 GB Mobile Ultra works fine!
With the enclosed reader it is really fast via USB.
nicelad_uk said:
the device can only read at a certain speed, which is nearer class 4.
Click to expand...
Click to collapse
Cheers for the heads up about the TP2's read speed.
I was going to go for a 16GB class 2 but now might hold out for a class 4.
Haven't noticed any speed difference between my 8GB class 4 and 6 cards except that it's possibly slower than my Trinity but that may be due to the crummy TP2 stock ROM...
cocoaju said:
Shall I just get 2 8GB and hot swap the 2 cards as need be?
Click to expand...
Click to collapse
Please don't get two 8GB's, you will ruin the back cover of the device swapping the cards over all the time
My understanding is that the Class affects write speed, not read speed, so you won't see a difference playing movies on one or the other. You will see a difference in the amount of time it takes to get the movie onto the card (providing you aren't using ActiveSync, which will slow things down way beyond Class2 speeds).
I have a SanDisk Class 2 16 GB card on my Vogue and watch movies just fine with CorePlayer. Maybe a brief stutter once every 5 minutes or so, which I attribute to WinMo doing some other task in the background, not the read speed of the card.
In short, if it doesn't matter to you how long it takes to transfer large files onto the card, go with the least expensive.
Haven't noticed any speed difference between my 8GB class 4 and 6 cards except that it's possibly slower than my Trinity but that may be due to the crummy TP2 stock ROM...
Click to expand...
Click to collapse
Really? How much slower?
Yeah, I think I will go for 16GB for sure. The only thing now is what class. I am hearing 2 things here. I am worried about stutters on watching movies.
Some are saying speed only matters to write and not read.
But then I have read that it does matter, that is why there is a SDTuneUp for the HD.
I really don't want to buy a cheaper Class 2 card and only finding it is not working to my standards. I am pretty fussy about these things.
Any of you needed to install the SDTuneUp registry edit for the TP2? Do we need it? Anyone did any tests?
cocoaju said:
Really? How much slower?
Yeah, I think I will go for 16GB for sure. The only thing now is what class. I am hearing 2 things here. I am worried about stutters on watching movies.
Some are saying speed only matters to write and not read.
But then I have read that it does matter, that is why there is a SDTuneUp for the HD.
Click to expand...
Click to collapse
Check this out.
And this.
Class rating only refers to write speed, even though on the official SD association page it says "transfer speed." What they don't say is that it's transfer speed only one direction.
ajbopp said:
Check this out.
And this.
Class rating only refers to write speed, even though on the official SD association page it says "transfer speed." What they don't say is that it's transfer speed only one direction.
Click to expand...
Click to collapse
Hello ajbopp,
Thanks for your additional information. I think not a lot of people actually realise this. I always thought the Class Rating was how you determine transfer speed and not just write speed.
But there must be some ratings for Reading. Some cards are faster than others and that will certainly affect the rate of requiring information from the card, right? Because files are written in blocks and are distributed everywhere (fragmentation), so if the card is faster, then finding the blocks will be quicker, hence a better performance for reading movie files.
Just thinking logically how computer hard disk works. Not sure if that applies to SDHC cards. I also think the speed is also determined by the drive (the hardware reading/writing on the card).
There aren't many information on this. I have been searching around and most information I found was given by the companies that made these cards. Real tests are few and far between. Most websites I visited, tells me only of the write speed as I think that is what is most important to people who uses these cards, such as Photo Fanatics who needs speed for taking high end photos very quickly and for taking HD videos at 30fps. There is less need to know about read speed.
It's so confusing...
Got it yesterday. Thanks for all your help guys!
I finally went for the Transcend 8GB Class 6 Micro SDHC. Cost of only $187 HKD, roughly $23 USD. Didn't end up getting the 16GB as they didn't have any in stock and it costs 3 times the amount.
Without any tests, I just loaded my movies and it played very well. No dropped frames. No tweaks whatsoever.
Hello!
I had a TP with a Micro SD 8GB Class 2 card.
I'm considering buying a new one (lack of space available) and I wonder if I should consider a class 4 or 6...
I use the MicroSD to store software, pictures (camera), music (to listen), and some videos (to watch).
I don't intend to remove the microsd from the TP2 slot (have to remove the cover) so what I usually do is to connect via USB cable (data instead of AS).
So, transfering data like this will I notice difference with Class 2, 4 or 6?
I'd get a good price with this:
http://www.amazon.com/Kingston-Technology-SDC2-16GB-microSDHC/dp/B001RPD06I
is it good enough or should I buy a Sandisk or perhaps a Class 4 or 6?
Thanks
SanDisk and Kingston are both good manufactures.
Class 4 is faster than class 2 and class 6 is faster than class 4.
But on the other hand: class 4 cards need more power consumption than class 2 cards and class 6 cards need power consumption than class 4.
For this reason I bought 1 x 16gb class 4. That is the compromise of speed and power.
doktor_ppc said:
Class 4 is faster than class 2 and class 6 is faster than class 4.
Click to expand...
Click to collapse
Again, this is only for write speed. I think it's an important distinction to make, especially if you are hoping for better video playback because of a faster card. The class of the card is not likely to have any impact on the device's performance, either video or anything else (other than file saving/writing operations).
so... for my kinda use there is no need for a class 6 right?
do you think a class 2 kingston MicroSD 16GB can be used for what I want?
playback music and some video... storage ... navigation?
Where is the best/cheapest place to get SD cards?
I am thinking about getting a 32gb card for all my music etc..
And...
Is there a big difference between the "classes"?
http://lmgtfy.com/?q=MicroSD+card+classes
you got two options when it comes to 32gb cards, $80 for a class 2, or $150 for a class 4. Video over 2mbps may studder on class 2 cards.
Kingston introduces Class 4 32GB microSDHC card, charges dearly for the speed
16gb class 4 @ frys for 32$.
Best deal I've seen..
Sent from my SGH-T959 using XDA App
Class? Kinda, if you have an 8gig at class 6 and you move up to a 16 gig running at class 6 the larger drive will be slower. The reason being you need more voltage for 16 gig to reach class 6 then an 8gig. The phone won't provide it though since its voltage is regulated so not to incur more heat on the phone and damage the internal hardware. With 32gig being twice the capacity its hard to say how many volts it would need to hit class 4 speeds but its probably best to run benchmarks to see
psychoace said:
Class? Kinda, if you have an 8gig at class 6 and you move up to a 16 gig running at class 6 the larger drive will be slower. The reason being you need more voltage for 16 gig to reach class 6 then an 8gig. The phone won't provide it though since its voltage is regulated so not to incur more heat on the phone and damage the internal hardware. With 32gig being twice the capacity its hard to say how many volts it would need to hit class 4 speeds but its probably best to run benchmarks to see
Click to expand...
Click to collapse
Nice info, did not know that...
Sent from my SGH-T959 using XDA App
The K-Zoo Kid said:
Where is the best/cheapest place to get SD cards
I am thinking about getting a 32gb card for all my music etc..
And...
Is there a big difference between the "classes"?
Click to expand...
Click to collapse
www.supermediastore.com is my favorite place. They are having a deal right now for a Class 10 32GB for $56.77 (click link) AData and Transcend have pretty much done me right so far.
psychoace said:
Class? Kinda, if you have an 8gig at class 6 and you move up to a 16 gig running at class 6 the larger drive will be slower. The reason being you need more voltage for 16 gig to reach class 6 then an 8gig. The phone won't provide it though since its voltage is regulated so not to incur more heat on the phone and damage the internal hardware. With 32gig being twice the capacity its hard to say how many volts it would need to hit class 4 speeds but its probably best to run benchmarks to see
Click to expand...
Click to collapse
I cant agree. Micro SD cards have a 3.3V standard, most are pretty close to the same amperage draw also. If you follow most memory trends the larger the chips and capacity gets, the less power required and usually smaller build technology. So while in theory I think larger would equal more power, I dont actually think thats true. I think newer, larger cards use less power than older smaller ones. Even if they are much faster. Just my opinion, not fact.
So my advice is to get the largest and fastest card you can. Have yet to have any adverse effects on any phone.
techboydino said:
www.supermediastore.com is my favorite place. They are having a deal right now for a Class 10 32GB for $56.77 (click link) AData and Transcend have pretty much done me right so far.
Click to expand...
Click to collapse
That's for a regular SD card. There's no such thing as a Class 10 32GB Micro SD. Not yet, anyway.
psychoace said:
Class? Kinda, if you have an 8gig at class 6 and you move up to a 16 gig running at class 6 the larger drive will be slower. The reason being you need more voltage for 16 gig to reach class 6 then an 8gig. The phone won't provide it though since its voltage is regulated so not to incur more heat on the phone and damage the internal hardware. With 32gig being twice the capacity its hard to say how many volts it would need to hit class 4 speeds but its probably best to run benchmarks to see
Click to expand...
Click to collapse
So my phone will overheat if i dont get a high enough class?
I guess my real question is, does it matter what class i have if i will strictly be using the card for music? I use my internal for everything else..
The K-Zoo Kid said:
So my phone will overheat if i dont get a high enough class?
I guess my real question is, does it matter what class i have if i will strictly be using the card for music? I use my internal for everything else..
Click to expand...
Click to collapse
Don't worry about the card overheating. The minor changes in voltage mean practically nothing to us.
If all you are storing is music (like myself) then just get a class 2. This one from Verizon is probably the cheapest one you're going to find. Basically anything cheaper (like from eBay or Craigslist) is most likely a scam.
gravis86 said:
Don't worry about the card overheating. The minor changes in voltage mean practically nothing to us.
If all you are storing is music (like myself) then just get a class 2. This one from Verizon is probably the cheapest one you're going to find. Basically anything cheaper (like from eBay or Craigslist) is most likely a scam.
Click to expand...
Click to collapse
Thanks bro.
Kubernetes said:
That's for a regular SD card. There's no such thing as a Class 10 32GB Micro SD. Not yet, anyway.
Click to expand...
Click to collapse
Good catch, jumped the gun on that one. But....there is certainly CL10 Micro SD's thats just not one of them. Do a quick Google search and youll find some for sale. Price is still pretty high though.
The K-Zoo Kid said:
So my phone will overheat if i dont get a high enough class?
I guess my real question is, does it matter what class i have if i will strictly be using the card for music? I use my internal for everything else..
Click to expand...
Click to collapse
No I'm saying your phone's microsd card will run as fast as a class 2 card if it's actually a class 4. I said the voltage is regulated that means it wont go over a predetermined amount. That is why the cards go slower and why they don't overheat.
Outside of Ebay, the best price I've seen for Class 2 32GB microSDHC cards is at
http://www.datamemorysystems.com/_memory-information/DM55_0981-2A.asp for a Transcend card.
Best price for Kingston's Class 4 32GB card is like $100.
Kingston and Transcend have just entered the 32GB microSDHC market this month joining SanDisk, so prices have dropped a bit and may drop more in the future.
psychoace said:
Class? Kinda, if you have an 8gig at class 6 and you move up to a 16 gig running at class 6 the larger drive will be slower. The reason being you need more voltage for 16 gig to reach class 6 then an 8gig. The phone won't provide it though since its voltage is regulated so not to incur more heat on the phone and damage the internal hardware. With 32gig being twice the capacity its hard to say how many volts it would need to hit class 4 speeds but its probably best to run benchmarks to see
Click to expand...
Click to collapse
So you're familiar with ohms law....or at least you'd say so ?
You do know that the voltage paths and the data paths are on different pins ..... right ?
Your post is one of the most ill-informed I've ever heard.
http://en.wikipedia.org/wiki/Secure_Digital#SDHC
Go there, learn something.
Voltage has NOTHING to do with read speed or data capacity.
They all run the same voltage, and *gasp* the same amperage.
I guess since volts x amps = watts....they must run the same wattage too
BTW, all SDHC chips are required to run under a very tight specification and they have to be licensed to run in that spec.....so there is no room for deviation in the voltage arena.
Here, since you are mis-informed of the class specs too (jeebus!).
The Speed Class Rating is the official unit of speed measurement for SD Cards, defined by the SD Association. The Class number represents a multiple of 8 Mbit/s (1 MB/s), and it measures the minimum sustained write speeds for a card in a fragmented state [10].
The following are the ratings of some currently available cards: [11]
Class 0 - These cards do not specify performance, which includes all legacy cards prior to class specifications.
Class 2 - Minimum of 2 MB/s performance. Lowest speed for SDHC cards.
Class 4 - Minimum of 4 MB/s performance.
Class 6 - Minimum of 6 MB/s performance.
Class 10 - Minimum of 10 MB/s performance.
Click to expand...
Click to collapse
n2ishun said:
Here, since you are mis-informed of the class specs too (jeebus!).
Click to expand...
Click to collapse
So your saying the card determines speed always? Your saying there will be no bottleneck ever? So no matter what, your card will run at peak speeds at all times on any device? Your saying that flash memory can do the impossible? Cpu's and ram need certain voltages to run at at top speeds. Your saying that no matter the voltage the memory will run at rated speeds at all times. I'm sorry but your wrong. Flash memory is like any other computer part. In order for it to reach optimal speed it needs current. If you don't provide enough voltage to ram it wont run at the rated speed it's setup for, same goes for cpu's/gpu's/ssd's and everything else. If you look here you will see that microsd cards vary in voltage from 2.7v's to 3.6v
http://www.sdcard.org/developers/tech/sdhc/
That means certain sd cards could use more voltage for different reason. 1 being they are rated at higher class of speeds 2. they need it because they are running a more condensed memory package. In order for class 6 cards to reach those speeds it needs enough electricity to run. Just like cpu/ram if there is not enough voltage it will run at slower speeds. With cpu/ram though you pick the speeds before hand. With sd memory they decided on a little more looser scheme. If the card gets enough juice it will run at it's optimal speed but if it doesn't it will have to drop to a slower speed. This is all done automatically so you don't have to worry about it since you might throw this memory in multiple devices and to setup multiple devices for it would be a pain. So yes I understand there is a difference between data paths and voltage paths I do know that voltage paths supply the power to run the data paths. With less power running the data paths the slower it will go. So with phones manufacturers lowering said voltage to better optimize there phones for power consumption and heat reduction it shouldn't be to hard to understand that these cards wont run at there rated speeds in said device. Phone manufactures are going to take the middle road and not allow 3.6v's to hit the microsd slot. That will cause to much heat and during stress tests they don't want to scrap a phone just because it can't handle the voltage needed to run cards at speeds most people wont notice. Most phones run at 3.3v's or less on there microsd slot. If your card needs 3.6v it wont just say "can't accept card" it will run it but it wont be able to provide enough juice to support it's rated speed.
If you still don't believe that devices cause bottlenecks run this test. All you need is 3 things (outside of your computer of course) a camera, memory for said camera (be it compact flash/sd/sdhc/microsd/etc) and a USB2 memory card reader. If you don't have these see if you can find someone who does or have them run these tests. Ok now either throw 100mb of files on the card or find a group of photos totaling near 100mb's. Now plug in the camera and copy those files to your desktop. See how long it takes (you don't need a stop watch cause the difference is not subtle) to complete the transfer and note the rated transfer speed and time. Now delete those files off your desktop and run again but this time with the card inserted into your media card reader. Jot down the rate of speed and time. You will notice a much quicker transfer with the media card read then the camera. The reason being as mentioned many times is that they regulate voltage on devices. With a media card reader it doesn't need to be regulated cause it's not setup to worry about battery drains and it doesn't need to worry about getting to hot. Unless you can figure out another reason why the camera would slow down the speed of transfer I would like to know.
I have a 32GB class 2 and it runs just fine for videos. I can play Avatar with no hiccups on it at all.
techboydino said:
Good catch, jumped the gun on that one. But....there is certainly CL10 Micro SD's thats just not one of them. Do a quick Google search and youll find some for sale. Price is still pretty high though.
Click to expand...
Click to collapse
No, the link you showed is a 16GB. Again, there is no such thing as a Class 10 32GB Micro SD card at this time. Sandisk has a Class 2 and Kingston a Class 4, but nothing faster is out on the market right now.
blah blah, whatever
Learn what voltage is
Learn what current is
You're talking out of serious lack of knowledge.
That phone you are speaking of IS NOT a desktop computer, the devices are not singular and replaceable, let alone capable of a variance of factors.
You simply do not go into the bios and tweak the settings on a phone.
If the SD card runs or not is the factor, *voltage* (ahem) does not change, it is STATIC!
I guess YOU could always slap a RAID card in it and SLI some video chips....
But back in the real world.....
Can someone do that test? Will a Class 6 card work at Class 6 speeds in the phone? I would think so since cards are classified based on minimum sustained transfer... even if a particular card can get higher output in certain applications, it shouldn't fall below the minimum class rating, right?
Hey Ppl...
What Type Of MicroSDHC Class, Should I Buy For Arc?
Class 4, 6 or 10?
Right now i´ve Class 2
Its better to get the highest which is class 10 if u can afford..
The Classes guarantess a lowest speed while newely formated
class 2 is 2MB/s
class 6 is 6MB/s
class 10 is 10MB/s
and so on
but with luck a class 2 card can outpreform a class 6 card but you never know untill you have bought it.
the use of a higher class is more important how often you transfer big amout of files/data from and to your phone (this is when you will notice a slow card)
everyday use the class 2 card that is shipped with the phone works perfect
I'm going for a 16GB Kingston Class 10 for mine, might go 32GB but that'll depend on how much I get for my X10 on ebay.
XperienceD said:
I'm going for a 16GB Kingston Class 10 for mine, might go 32GB but that'll depend on how much I get for my X10 on ebay.
Click to expand...
Click to collapse
Put my X10 on ebay yesterday!
How much you asking for it?
For no OT, I bought a 32 GB Lexar class 10 MicroSDHC
LususNaturae said:
Put my X10 on ebay yesterday!
How much you asking for it?
Click to expand...
Click to collapse
Not sure yet, it's a bit weared so not expecting a great deal.
Here's the thing: the class of an SD card only defines how fast you can *write* to it. The read speeds of all cards tend to be the same regardless of class.
What a faster class of SD card will get you:
* faster copying of files from PC to SD, e.g. music, video
What it won't get you:
* a faster running phone (i.e. no 'snappier' performance)
* apps loading faster
* faster copying of files from SD to PC
* music/video playback improvements
* faster installation of apps - these are stored in internal memory, and even for builtin apps2sd the limiting factor tends to be the download speed
What it might get you:
* faster stills camera operation (havent checked for the arc, there may be bottlenecks elsewhere in the system, e.g. cpu)
* i thought it might solve the video capture glitching, but apparently the new firmware has fixed this regardless of SD card class.
* some apps which write a lot of data to SD card may run faster (note however that for most apps data is stored in internal storage)
Nothing inherently wrong with getting a faster card, just dont delude youself you'll see much of a difference in day-to-day operation.
Oh, i forgot, EXCEPT one other thing: If youre using 'full' apps2sd on a rooted phone (i.e. with an ext2 partition moving all apps+data+dalvik cache onto it) it will definitely help to have a faster class of SD card. Dunno if anyone really still does that these days...
I've always found going bigger and faster to be best, but valid points made.
daveybaby said:
Here's the thing: the class of an SD card only defines how fast you can *write* to it.
Click to expand...
Click to collapse
That's incorrect - the class rating is a guarantee of both read and write speeds.
daveybaby said:
The read speeds of all cards tend to be the same regardless of class.
Click to expand...
Click to collapse
You can't guarantee that any more than you can guarantee that a Class 2 card will write at speeds higher than 2MB/s.
The only way to be sure of getting a card that will read at a certain speed is to buy the appropriate class.
Step666 said:
That's incorrect - the class rating is a guarantee of both read and write speeds.
Click to expand...
Click to collapse
That's a nice opinion, but unfortunately it's just wrong.
Have a look at this. Notice they dont mention read speeds anywhere, that's because theyre already so fast regardless of class that it's irrelevant.
When you buy a class 10 SD card, youre spending your money on faster writes.
The read speeds of all cards tend to be the same regardless of class.
Click to expand...
Click to collapse
The limiting factor in read speeds is the interface, not the memory technology. I believe SDXC may have faster interface specs than SDHC (which in turn has faster specs than plain SD), but this is nothing to do with class, and make no difference if youre plugging them all into an SDHC device anyway.
Try reading that page again, it doesn't say that the class certification is a measure of writing speed, it says it's the bus-interface speed - it merely mentions write speeds as examples of why you would need higher speeds in real life.
The read speeds that the cards are actually capable of may well be higher but in practice the write speeds are almost always higher too - but there's no guarantee they are.
Step666 said:
Try reading that page again, it doesn't say that the class certification is a measure of writing speed, it says it's the bus-interface speed - it merely mentions write speeds as examples of why you would need higher speeds in real life.
Click to expand...
Click to collapse
So it's just a coincidence that nowhere does anyone mention read speeds, only write speeds and recording, when talking about flash memory. Because nobody's interested in read speeds, right?
Look, the read speeds of flash memory devices are stupidly high compared to write speeds (and always have been), and are limited by the interface, the write speeds are limited by the technology of the memory itself (which is the bit all of the manufacturers have spent millions (probably billions actually) improving over the last 10 years.
I hate quoting wikipedia articles but:
The Speed Class Rating is the official unit of speed measurement for SD Cards, defined by the SD Association. The Class number represents a multiple of 8 Mbits/s (1 MB/s), and meets the least sustained write speeds for a card in a fragmented state.[17]
These are the ratings of all currently available cards:[14][24]
Class 2, 2 MB/s
Class 4, 4 MB/s
Class 6, 6 MB/s
Class 10, 10 MB/s
Click to expand...
Click to collapse
I can see this going round in circles. From what I've read, basically, if you put a class 10 card in a phone that has been running a class 2 card then you're not going to see the difference like you would putting 4GB of memory in a PC that has been running on 512MB, but having a higher class of card will improve some areas behind the scenes so to speak.
If I didn't have an X10 to sell then chances are I'd stick with my class 6 Samsung but as I'll have the money to go class 10 I am doing.
daveybaby said:
Look, the read speeds of flash memory devices are stupidly high compared to write speeds...
Click to expand...
Click to collapse
And?
Real-world write speeds on cards are generally higher than their class rating would suggest but you are only guaranteed the speed corresponding to the class the card is.
Exactly the same applies to read speeds, they will most likely be much higher in real life but you are only guaranteed the speed that corresponds to the rated class of the card.
The class of a card guarantees minimum read and write speeds but both will likely be noticeably higher in real life.
Class has nothing to do with read speed period. Manufacturers only guarantees the write speed based on classifications because read speed will only be the same for all class of cards. Try the "Sd Tools" app if you don't believe me.
Therefore, unless you are using the defunct "app2sd+ data, dalvik", there should not be any discerning difference except for its higher price.
Sent from my LT15i using XDA App
Step666 said:
And?
Click to expand...
Click to collapse
And the read speed limit is defined by the interface implementation not by the class of the card. When i say flash read speeds (i.e. reading data from the cell) are fast, i mean theyre to all intents and purposes instantaneous, they always have been - they havent gotten any faster in the last 20 years - it's inherent in the technology. The thing that takes all the time is shuffling the bits of data across the serial interface.
It's entirely possible for a class 2 card by one maufacturer to have faster read speeds than a class 10 card by another manufacturer. It's entirely possible for the same card to have different read speeds in different devices due to the interaction of the interface implementations (subtle timing differences). Write speeds arent affected by this as much because the bottleneck is the large amount of time it takes to erase a cell and rewrite it.
Note that if you have a really old class 2 card, it's probably going to have much slower read speeds than a brand new class 10 card. This is not inherently due to the class of the card, it has everything to do with the fact that manufacturers only implemented faster interfaces to handle class 10 cards once the technology to *write* at this speed became available. Due to economies of scale they implement these faster interfaces across the board. New class 2 cards will be able to read as fast as new class 10 cards.
That's all i'm going to say on this matter, if you dont believe me you dont believe me, i'll agree to disagree.
daveybaby said:
That's all i'm going to say on this matter, if you dont believe me you dont believe me, i'll agree to disagree.
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I'm afraid I don't, we'll have to disagree.
The sdhc that came in the box has a class 2 rating in it but using sd tools, it writes at 6mb/sec average, bursting at 9mb/sec. Read speed is the same as my older 8Gb class 6 at 19-20mb/sec.
Step666 said:
I'm afraid I don't, we'll have to disagree.
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Cool
I have Sandisk Micro HDSD 16GB Class 2 but in SD Tools Write Speed: 10.1Mb/s, Read Speed: 27.5Mb/s
Hi,
I want to buy a 32 gb micro sd for my Atrix, but I see there are different Classes....
I saw in TheCellGuru a 32 gb Class 2 for about 75 bucks. But I remeber I had a Class 4 8gb, so what is the difference?
Can my Atrix read any 32gb card? Should I look for another one?
Thanks!
The higher the class the faster the SD card.
Sent from my MB860 using XDA App
Thnx. But can Atrix read any class? What class should I get?
dragoncius said:
Thnx. But can Atrix read any class? What class should I get?
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if you can live with the slower speed, den the 32gb is fine.
But whats the deal with speed? Does it affect performance on the phone or just data transfer time when moving files to and from the micro sd?
Enviado desde mi Motorola Atrix™ usando Tapatalk
IIRC, class speed also affects how fast the SD loads on your phone.
Thnx. So, lets say I never turn off the phone, and the sd card will load only once, getting a 2 class sd isnt a bad idea. Am I right?
Enviado desde mi Motorola Atrix™ usando Tapatalk
Can someine confirm if Atrix supports Class 6 32 gb micro sd?
Enviado desde mi Motorola Atrix™ usando Tapatalk
Yes an ATRIX will support a class 6 32gb SD ( finally moto adds ATRIX as a word in their keyboard lol)
Sent from my MB860 using XDA App
neer2005 said:
The higher the class the faster the SD card.
Sent from my MB860 using XDA App
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Click to collapse
Slight correction: the higher the minimum speed guarantee. A class number defines the absolute minimum write speed of an SD card. Devices can read the class from the card and with that can set some expectations in the software for how long things should take.
So with that, there are Class 2 cards that actually, out of the box, perform better than cards with a much higher class. Will they forever, once worn and fragmented? Maybe not.
It's all very vague, exactly what the manufacturers want
I had a class 2 8GB card and now have a class 4 32GB card ($45 on amazon with their goldbox deal, kingston) and the class 2 is like 2 mbps faster than my class 4... maybe i should have gone with the class 2...
I have a Lexar 32Gb class 10, it's working despise of some bad comments around it, so far, so good. The class of the card is about the reading speed - the higher, the better (in theory).
I have the 32g class 10 lexar but it failed on my once and I needed to reformat it. If I had to by another one I would stick with sandisk. They are pretty solid.
Generally class determines the speed of Read and Write.
Class 4 is usually the minimum requirement for HD recording as it requires faster writing abilities.
Not all microSD have the same speeds as each company varies with speed even if they are the same class. Some class 4 could actually be faster than class 6.
Beware of fake microSD as usually that may be one of the reasons that it could be slower or even die out within the first week of usage.
I would recommend using SD Tools in the market place as soon as you receive your card.
https://market.android.com/details?id=ales.veluscek.sdtools&feature=search_result
Just be patient with the deals, there's always a lower price.
Careca_RS said:
The class of the card is about the reading speed - the higher, the better (in theory).
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Click to collapse
Write speed, not read speed. The whole "class" thing is confusing enough without people giving incorrect information. Sorry to be so pedantic.
Here it is direct from the source (PDF): http://www.sdcard.org/developers/te...lified_Specification_Ver3.01_Final_100518.pdf
Also from the source, a simplified overview: http://www.sdcard.org/developers/tech/speed_class/
Class is based on write speed because SD cards (well MMC) of course were originally conceived of for use with digital cameras and camcorders, where write speed is critical, but read speed much less so.
_kansei_ said:
Write speed, not read speed.
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Yeap. That's what I meant.
Thanks for the correction
Thabks everyone! I will wait and be on the look for a nice deal. Thnx!
Enviado desde mi Motorola Atrix™ usando Tapatalk
I just tested my 16GB class 2 MicroSD (Patriot brand, off newegg) that i've had for a year or two. The minimum write speed during the benchmark was 10.5 MB/s, i.e. Class 10 speeds. Read speeds were 16MB/s. I'm pleased
Since there's a high variance, all you can do is buy a card based on brand reputation and the class rating and hope that it's actually faster than the class suggests. Does it need to be faster? I dunno, I only use my card for media storage.
Mgamerz said:
I had a class 2 8GB card and now have a class 4 32GB card ($45 on amazon with their goldbox deal, kingston) and the class 2 is like 2 mbps faster than my class 4... maybe i should have gone with the class 2...
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Click to collapse
greetings, im new to the forums (and the atrix, only had this baby for two days now), but i can shed some light on the matter.
with the microSD cards, the class tells you the minimum write speed. class 2 = 2mb/s minimum. class 4 = 4mb/s minimum. hence your class 4 is meant to be 2mb/s faster than class 2.
at the moment, i use a class 10 16gb from kingmax. for the most part, most people wont notice the difference between most classes, but if you want to take lots of photos in rapid succession or if you plan to film 720p footage directly to the SD card, or even if you watch really large videos, its generally better to go for a higher class.
sure, you can still take a 5-8mp photo and save it to a class 2, but at class 2 speeds, it would take ~1 second for the photo to save. on a class 10, it takes ~0.2 seconds for the same photo to save (assuming all else remains the same), which can come in handy for quick snaps. but given the amount of ram we have on the atrix, i'd assume it would buffer to ram first and copy later so it wouldnt be much of an issue.
I took a chance....
I took a chance and bought some Chinese 32GB cards supposedly rated for Class 10.
I ran a test on one of the cards , placing it inside my phone, using SD tools (from the market)
It reported write speeds of 4.0 MB/s and read speeds of 5.3MB/s. In theory that's about a class 6 but there are supposedly latency issues that creep up as the cards get larger.
I need to compare that number to known cards before I say anything about the source. I'd be curious to see test results from this app on other atrix's with other microSD cards.
I do notice that it is faster loading everything than my SanDisk 16GB class 2 card. My camera works faster too: faster to load the pictures and faster to take them.
Hey, im planning to buy a 32gb sdhc for my xperia play. I referred to this thread --> http://forum.xda-developers.com/showthread.php?t=1150369
Well its kind of an old thread. Is Sandisk 32 gb Class 4 still good for xperia play specifically for games? Im still waiting for the stores to sell class 6 cards in my place.. they only have class 4 atm.. should i wait for class 6 or should just buy class 4? and which is better? Sandisk or Kingston?
I think its already been discuss in the accessories section. Might wanna look it up.
Kindly Hit Thanks Button if i've help u in any way.
Kingston? You've got to be kidding me. :laugh:
sdojoin said:
I think its already been discuss in the accessories section. Might wanna look it up.
Kindly Hit Thanks Button if i've help u in any way.
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Hi. looked it up already but threads arent closely related and answers were mostly vague and irrelevant. Hope you can help.
narflynn619 said:
Kingston? You've got to be kidding me. :laugh:
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Troll somewhere else. Saw you on alot of threads and 90% of the time you just troll around and even discriminate people out of nowhere. Filipinos like you are the reason why people think every Filipino guy suck. Grow some balls and be mature.
What do u need it for?? Gaming or fast file transfer?? Its already been explain in the link u gav n the thread i ask u to look up had already shows a few people running it for their own personal reason. I personally like sandisk. As for the class i'd go for class 6. It kinda balance out the gaming n the fast file transfer. But thats me.
Loving my class 6 SanDisk
sdojoin said:
What do u need it for?? Gaming or fast file transfer?? Its already been explain in the link u gav n the thread i ask u to look up had already shows a few people running it for their own personal reason. I personally like sandisk. As for the class i'd go for class 6. It kinda balance out the gaming n the fast file transfer. But thats me.
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The thread i gave had class 4 as the winner but some guys say that class 6 sandisk is better and the posts were newer. Their phones arent Play either. As ive said, im gonna use it for gaming.. Is the difference from class 4 and class 6 really noticeable in games?
jacklebott said:
Loving my class 6 SanDisk
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Have you had any experience using class 4? is it noticeable in games?..
Using class 10 SanDisk lol. Works well on my Play.
Sent from my awesome Xperia Play
The higher the class the better. I'm looking at getting a class 10.
natewiebe13 said:
The higher the class the better. I'm looking at getting a class 10.
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uh. no. you can check out the thread i gave on the first post. If youre goin to use it for games, that's not recommended since its goin to lag alot.
I purchased a 32GB Class 10 Micro SDHC card for just over $30 (USD) after shipping and it works great! Very fast and great price for the quality (make sure you buy it from the default seller "Amazon" because others MAY send out fakes but the real one is great.
nairav said:
uh. no. you can check out the thread i gave on the first post. If youre goin to use it for games, that's not recommended since its goin to lag alot.
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WRONG!! Class 10 is VERY high transfer speed where as low numbers lag like s***
Trust me, I've wasted 20 bucks on a 32GB Class 1 SDHC card and it was so slow it's not even funny, and almost nothing could read the card either, out of 6 computers in the house AND a 3DS 1 computer could read it and the 3DS said that it was not fast enough and refused to use it at all. I don't know where you heard that high class cards lag but that's wrong as there IS a VERY NOTICEABLE difference in speed between the 8GB Class 2 the XPlay shipped with and a Class 10 card and the Class 10 is WAY faster.
Proof! and More proof!
Hav u tried any HD games yet?? I think the lag he meant is for gaming. Just curious.
Kindly Hit Thanks Button if i've help u in anyway.
Lag for any situation is EXACTLY the same based on the read/write speed of the micro sd card meaning games all lag if you have a low class card and are faster with a high class. The faster the read speed of the card the faster the game is regardless of the game.
Sent from my R800x using xda premium
loismustdie555 said:
I purchased a 32GB Class 10 Micro SDHC card for just over $30 (USD) after shipping and it works great! Very fast and great price for the quality (make sure you buy it from the default seller "Amazon" because others MAY send out fakes but the real one is great.
WRONG!! Class 10 is VERY high transfer speed where as low numbers lag like s***
Trust me, I've wasted 20 bucks on a 32GB Class 1 SDHC card and it was so slow it's not even funny, and almost nothing could read the card either, out of 6 computers in the house AND a 3DS 1 computer could read it and the 3DS said that it was not fast enough and refused to use it at all. I don't know where you heard that high class cards lag but that's wrong as there IS a VERY NOTICEABLE difference in speed between the 8GB Class 2 the XPlay shipped with and a Class 10 card and the Class 10 is WAY faster.
Proof! and More proof!
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Class 1 SDHC? Pretty sure that doesn't exist. Unless you mean UHS Class 1 (which stands for Ultra High Speed Class 1) which is rated at/above class 10...
jacklebott said:
Class 1 SDHC? Pretty sure that doesn't exist. Unless you mean UHS Class 1 (which stands for Ultra High Speed Class 1) which is rated at/above class 10...
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IDK but whatever it was, it was the crappiest card I ever got.
nairav said:
Filipinos like you are the reason why people think every Filipino guy suck.
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Um...I can honestly say I don't think Filipinos suck...
natewiebe13 said:
The higher the class the better. I'm looking at getting a class 10.
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not really true as class 4 and 6 have faster random read and write speed,
my old class 4 sandisk is one of the fastest i ever have, even faster than my class 10 sandisk in few cicumstances