Develop Bugs

upgrade from microSD Class4 to Class6

Hello,
I have a 4gb Class 4 microsd for my Cruise,
considering getting a 8gb Class 6.
Has anybody tested both of these speeds to see if there are any difference on read/write performances??
thanks a lot..
in.

inthemerde said:
Hello,
I have a 4gb Class 4 microsd for my Cruise,
considering getting a 8gb Class 6.
Has anybody tested both of these speeds to see if there are any difference on read/write performances??
thanks a lot..
in.
Click to expand...
Click to collapse
not sure but i think power consumption is also a concern. i understand that 4vs6 is about a 2MBps difference, however i think class 6 draws more power. anyone care to comment?

m.carroll said:
not sure but i think power consumption is also a concern. i understand that 4vs6 is about a 2MBps difference, however i think class 6 draws more power. anyone care to comment?
Click to expand...
Click to collapse
Thats really not woth anything. if you are considering upgrading because of speed, then look at the specs not the class. class just says what minimal speed it should have.
so class 4 = 4MB class 6=6MB. but there are much faster cards out there. even before those class 6 came out. You could go and buy the
"SanDisk Secure Digital High Capacity Extreme III 8GB"
it has around 20MB speed.

Raziel1 said:
Thats really not woth anything. if you are considering upgrading because of speed, then look at the specs not the class. class just says what minimal speed it should have.
so class 4 = 4MB class 6=6MB. but there are much faster cards out there. even before those class 6 came out. You could go and buy the
"SanDisk Secure Digital High Capacity Extreme III 8GB"
it has around 20MB speed.
Click to expand...
Click to collapse
Obviously I m for the speed difference. But I think you r missing a point here, I m talking about a microSD (class 2,4,6). the one u r referring to is a normal size SDHC card.
Yes, the power comsumption might be a slight problem, but I can cope with that, I m interested in faster transfer rates.
Any other ideas folks?

inthemerde said:
Obviously I m for the speed difference. But I think you r missing a point here, I m talking about a microSD (class 2,4,6). the one u r referring to is a normal size SDHC card.
Yes, the power comsumption might be a slight problem, but I can cope with that, I m interested in faster transfer rates.
Any other ideas folks?
Click to expand...
Click to collapse
i your right, i didn't see that. but still, you should take a look at the extreme series of Sandisk. they have got the fastest cards out there

Time for a new micro sd card

I'm buying a larger SD card in readiness for Froyo (and I need more room for music!).
I've already filled up the 4GB card that came with the phone. Is it simply a case of copying everything from the 4GB card onto a computer, inserting the new card and copying it all back? Or is there some funky protection scheme in some app data which will break everything?
Also, will Eclair be able to format the new card (it's 32GB)? I think Windows 7 only formats fat32 on smaller drives.
Any information or other peoples experiences would be welcome.

If you just have one 4Gb partition it is safe to copy all the files to the new one and it should work without problems (copy also the hidden files).
For the format, Windows 7 can format it. Not sure if fat32 or exFat, but it can format it for sure.

Remember to buy a class 6 sdcard.
it will be much faster.

Oby One said:
Remember to buy a class 6 sdcard.
it will be much faster.
Click to expand...
Click to collapse
Just wanted to jump in here to clarify this statement. Higher classes means faster write speeds. There are no difference in read speeds.
Therefore...
- Having a higher class card will not result in better performance in tasks like generating thumbnails when viewing photos in your Photo application.
- If your application is installed on your card, higher classes will not mean faster application performance. Again, read speeds are not affected.
- Having a higher class card will mean you will be able to transfer files from your PC to your card faster.
That being said, you should buy the highest class card you can afford. But you should prioritize capacity over speed.
Tip: Pass on class 2 cards. They may start choking when you use your device to record 720p video.

ohyeahar said:
Tip: Pass on class 2 cards. They may start choking when you use your device to record 720p video.
Click to expand...
Click to collapse
Zero problems with my Sandisk 16gb Class 2 card. It writes at a sustaining 7.5mb/s, so faster than Class 6 minimums anyway.
Regards,
Dave

Thanks for all the advice guys.
Regarding the class, it has to be class 2 - it's the only thing available in 32GB.
However, as ohyeahar said, it's only write speed. I don't think a 720p stream will be a problem given the benchmarks I've seen for the Sandisk 32GB card. It seems to be writing at 5-7Mb/s so well above the Class 2 minimum.

I'm also buying a new microSDHC card. Should I format it in NTFS or FAT32?

Laban said:
I'm also buying a new microSDHC card. Should I format it in NTFS or FAT32?
Click to expand...
Click to collapse
Correct me if I'm wrong but when I format it on my computer, my desire always tells me to do it again anyway on my phone that is
Sent from my HTC Desire using XDA App

lennshow66 said:
Correct me if I'm wrong but when I format it on my computer, my desire always tells me to do it again anyway on my phone that is
Sent from my HTC Desire using XDA App
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Click to collapse
Ah, of course! That must be the correct way of doing it. Thinking of buying the Sandisk Mobile Ultra 16GB or the Transcend Class 6 16GB or A-Data Class 6 16GB.
Any recommendations?

Where is everybody looking to get their memory cards from? I'm currently looking for the best deals and struggling to find any decent ones tbh

ohyeahar said:
Just wanted to jump in here to clarify this statement. Higher classes means faster write speeds. There are no difference in read speeds.
Therefore...
- Having a higher class card will not result in better performance in tasks like generating thumbnails when viewing photos in your Photo application.
- If your application is installed on your card, higher classes will not mean faster application performance. Again, read speeds are not affected.
Click to expand...
Click to collapse
Click to expand...
Click to collapse
I think you are not well informed. Higher class cards also offer higher read speeds and that is very important.
In my phone applications are also writing to card so having a higher class card makes all the difference. especially if you are using it with a swap partition.
I don't have the link to the benchmark right now but I will show you tomorrow the different read/write speeds in different class cards
Therefore...
- Having a higher class card will not result in better performance in tasks like generating thumbnails when viewing photos in your Photo application.
Click to expand...
Click to collapse
Yes it will
- If your application is installed on your card, higher classes will not mean faster application performance. Again, read speeds are not affected.
Click to expand...
Click to collapse
yes it will
later edit:
I don't remember exactly the values for read speads but from my tests they were something like this
cls2 15mb/sec
cls4 18mb/sec
cls6 21mb/sec
for me ...speed is everything so class 6 it's my choice

Oby One said:
I think you are not well informed. Higher class cards also offer higher read speeds and that is very important.
Click to expand...
Click to collapse
Sorry, but that just isn't the case!
The class of an SD card is purely the minimum sustained write speed that the card will achieve in a completely unfragmented state. It has *nothing* to do with read speeds.
Case to point, here are the benchmarks for two of my MicroSD cards:
16gb Sandisk Class 2
Sequential Read : 20.050 MB/s
Sequential Write : 7.415 MB/s
8gb Transcend Class 6
Sequential Read : 19.938 MB/s
Sequential Write : 15.020 MB/s
Note that the read speeds are almost identical, but the write speed of the class 6 is almost twice the amount. However, the write speed of both cards is well in excess of the class 6 minimums and given that there's far less writing going on than reading, the difference in write speed is practically negligible on the Desire.
Which card do I used in my Desire? The 16gb Class 2 and I experience absolutely no lag whatsoever using my phone, and I'm using Froyo Apps2SD.
Regards,
Dave

Laban said:
I'm also buying a new microSDHC card. Should I format it in NTFS or FAT32?
Click to expand...
Click to collapse
fat32
10 chars

Hmm, maybe because it's a newer generation class 2 card?
perhaps my tests were done with older generation cards that gave out lower speeds.
Now I am curios...I can't wait to get back home and find the tests file.

foxmeister said:
Sorry, but that just isn't the case!
The class of an SD card is purely the minimum sustained write speed that the card will achieve in a completely unfragmented state. It has *nothing* to do with read speeds.
Click to expand...
Click to collapse
Yep, Dave is absolutely right, it's purely minimum sustained write speed for that class. And as you can see, his Class 2 card actually exceeds the class 6 spec for writing and isn't far off from Class 8 performance.
Looking around the web, the 32GB class 2 card I bought has similar performance in the benchmarks I've seen to Dave's Class 2 card. Not only that, the benchmarks are done on a PC. I doubt the phone has the I/O bandwidth to actually hit numbers like those in any kind of sustained way.

ok, my bad.
There is a slight difference between different brands (regarding read speed) but not so big.
regarding write speed .... I think that only if you use your sdcard with a swap partition you will see big differences.

What is difference in SD card classes

Ok I have an Acer Iconia a500, currently I have only a 6gb card installed. Now when i look online i see that the micro sd cards are rated by classes. What is that for?
I need a 32gb for my Iconia. I do alot of school work from it. Just want the storage for my school books. any way, can someone break it down for me?
Thank You
Sent from my A500 using XDA Premium App

The SD card's class represents the least write speed.
Class 2: 2MB/s
class 4 : 4MB/s
and so on..

I think it's so you can copy and read files faster

ok, got it, higher the class the faster the write speed.
One more thing, now, the higher the class, does anyone know if they have more problems? like with crashing, or having to be re formatted often?

primus123 said:
ok, got it, higher the class the faster the write speed.
One more thing, now, the higher the class, does anyone know if they have more problems? like with crashing, or having to be re formatted often?
Click to expand...
Click to collapse
Nope, problems/crashing etc would be down to quality not size.
Also faster write speed doesn't mean it performs faster when used as a "hard drive" like in a phone, so lower class ones can outperform higher, but you'd have to try them to see.
It's because they're designed with things like cameras in mind, where getting the image saved quickly so you can take another one is the most important thing.
In a mobile phone/tablet they're accessed more randomly, and that is where it's been found that some higher class cards don't perform as well.

Mini SD cards, so tiny for my big hands.
Those mini sd cards are SOOOOO small, I've lost a few over the past 3 years.

so which one should i get for my iconia

androidappdeveloper said:
Those mini sd cards are SOOOOO small, I've lost a few over the past 3 years.
Click to expand...
Click to collapse
Tell me about it, I just reordered one after giving up the search on my current one. It's not completely lost, I'll probably come across it one day when re-organizing the room.

I keep mine in those Sd card cases and shove it in a crown royal bag....

You're probably fine with a Class 2 microSD card, as you won't have large files (or a large amount of small files) written in a short time.

Write speeds are generally the most important feature of a memory card. Write speeds determine the amount of time it takes to transfer the data, the moment you for example, click the button on your camera to ask the camera to take the image. You will probably remember that back in the early days of SD memory cards, there was an awful amount of lag time on cards, i.e from when you heard the click on the button (when you asked your camera to take the picture), to when you heard the double click (which is normally when the image has been written to the card).
Read speeds indicate the amount of time it takes for a card to transfer the data to a PC/Laptop. I.e the amount of time it takes to read the data off the card. Generally the higher the capacity of the card, this will naturally give a higher write speed. So if you have a 32GB card full of data and its only a class 2, it would take much longer than a 32GB card thats class 10, to send all the info to your pc etc.
Class 10 cards are recommended for HD video, or minimum class 6 really. You will probably find a 16GB class 4 card for example, will not work on say a Samsung HD Camcorder. It will maybe store only 1 minute of video, as for some reason the HD cannot write the data to the card fast enough it would seem.

Anyone ever lose a mini SDK card?

Plus your SD class is high, more it is fast...

jerryfranks said:
Anyone ever lose a mini SDK card?
Click to expand...
Click to collapse
Yes, almost (I found it after w hile), bloody spring so strong it shot across the room!
Pity there's not some little leatherette folder with tiny slots for a few MicroSD cards, I'd buy one!.

iloveapple said:
Write speeds are generally the most important feature of a memory card. Write speeds determine the amount of time it takes to transfer the data, the moment you for example, click the button on your camera to ask the camera to take the image. You will probably remember that back in the early days of SD memory cards, there was an awful amount of lag time on cards, i.e from when you heard the click on the button (when you asked your camera to take the picture), to when you heard the double click (which is normally when the image has been written to the card).
Read speeds indicate the amount of time it takes for a card to transfer the data to a PC/Laptop. I.e the amount of time it takes to read the data off the card. Generally the higher the capacity of the card, this will naturally give a higher write speed. So if you have a 32GB card full of data and its only a class 2, it would take much longer than a 32GB card thats class 10, to send all the info to your pc etc.
Class 10 cards are recommended for HD video, or minimum class 6 really. You will probably find a 16GB class 4 card for example, will not work on say a Samsung HD Camcorder. It will maybe store only 1 minute of video, as for some reason the HD cannot write the data to the card fast enough it would seem.
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Click to collapse
Very helpfully post,thanks.
Sent from my GT-I9000 using Tapatalk

Try to continue promoting of you site.

Hi speed cards are more efficient at presenting and recording. It's really up to you. If you buy the cheaper version and it doesn't present at the speed you think it should you'll have answered your own question.

You guys have it mostly right. The higher class your card is the faster it can write a file to its memory, the trade off is that the higher class cards have slower rapid access speeds, something to do with how it prepares files before writing. Basically, a class 10 will write a 1GB file faster, but if you try to write 15 3MB files quickly your performance will suffer. For something like a phone I recommend a class 4 or 6. For cameras I'd go higher (I don't know a whole lot about cameras).

seems like its good

[Q] microSD vs microSDHC, speed differences?

When using FRX7.1 what kind of speed increase can I expect when upgrading to an SDHC card?

benutne said:
When using FRX7.1 what kind of speed increase can I expect when upgrading to an SDHC card?
Click to expand...
Click to collapse
None.
SD vs. SDHC is mostly about capacity. The speed boost from using a C10 or C6 card isn't realized unless you're using it in a cam shooting high-def video - where data transfer speed is required.
I guess you might see a *slight* boost, but I seriously doubt it.

Find a card that has the fastest random-read/write performance for small file sizes (8kb-256kb). Use a program like CrystalDiskMark or ATTO32 Benchmark to test it. It doesn't matter if its 2gb or 32gb, C4/C6 or C10 (in fact, most C10 cards have worse random-read/write performance than some C4/C6 cards).
C2/4/6/10 all refer to a minimum requirement for sequential-writes (2mb/4mb/6mb/10mbps). For a digital camera recording 1080p video, sequential-write performance is important. But as far as running a hacked-up OS, where we're going to be reading/writing small 32kb files anywhere in the card, you're going to want something "fast" in that sense (My Sandisk 8gb C4 performs best, then my A-Data 16gb C6)

[Q] A couple of questions regarding sdhc card + screen protectors

What's the difference between class? I see class 10 and class 4, class 4 is a lot cheaper then 10 but what's the actual difference? Does class 10 transfer files faster or something?
and also can anybody recommend a good screen protector? I had one come free with my case on eBay but it doesn't even fit the whole screen
Thanks all

Class refers to the minimum read/write speed in MB/sec. Reputable brands actually adhere to these speeds while others are relatively meaningless.

As stated above for SD cards.
And for screen protectors, get Xtreme guards, simoly looked amazing in my One X. Waiting for them to come in the mail for the S3 now.
Sent from my sexy white Galaxy S3 on T-Mobile.

Does it really matter though?

SD speed?
Depends on what you do with that card.
If it's a big card and you often transfer large files to and from it, transfer speed does matter.
If you record HD videos directly to your sd card and your card isn't fast enough your video might stutter or have artifacts.
If you put games on your SD card and those games depend on high transfer rates, you might get lag.
But since the S3 has at least 16GB of internal memory you should have enough space to put stuff that need high transfer rates to your fast internal memory.
A class 2 or 4 sd card should suffice for most people. If you need the high transfer rates though, you'll have to go with a faster card.

Cards get memory lag which means they slower to access files when they filled with a load of files, so ignore the class ratings because a decent quality Class 4 works better in everyday use than a cheap Class 10 even if it can potentially transfer faster.
And files for a phone aren't usually neatly lined up so easily the best value card is Class 6 or 10 SanDisk Ultra then you know your phone can handle anything you throw at it.

shamez23 said:
SD speed?
Depends on what you do with that card.
If it's a big card and you often transfer large files to and from it, transfer speed does matter.
If you record HD videos directly to your sd card and your card isn't fast enough your video might stutter or have artifacts.
If you put games on your SD card and those games depend on high transfer rates, you might get lag.
But since the S3 has at least 16GB of internal memory you should have enough space to put stuff that need high transfer rates to your fast internal memory.
A class 2 or 4 sd card should suffice for most people. If you need the high transfer rates though, you'll have to go with a faster card.
Click to expand...
Click to collapse
Ahh okay, I plan on watching movies and stuff I'll just go with the class 10 over the cheaper one I just wanted to know how it would affect phone use
I'm going to get this I think:
http://www.ebay.co.uk/itm/Sandisk-U...ain_3&hash=item4abb2020b8&_uhb=1#ht_500wt_969
16gb is more then enough for me plus the 11gb I have in my internal storage

UrbanDesigns said:
Ahh okay, I plan on watching movies and stuff I'll just go with the class 10 over the cheaper one I just wanted to know how it would affect phone use
I'm going to get this I think:
http://www.ebay.co.uk/itm/Sandisk-U...ain_3&hash=item4abb2020b8&_uhb=1#ht_500wt_969
16gb is more then enough for me plus the 11gb I have in my internal storage
Click to expand...
Click to collapse
Look for a seller with a much higher feedback because there's a serious chance you could get scammed with a fake card there.
But if you find a genuine one that is a good one, but personally I'd spend a bit more for the 32gb card then you know you've always got enough space if your needs change.

Geordie Lad said:
Look for a seller with a much higher feedback because there's a serious chance you could get scammed with a fake card there.
But if you find a genuine one that is a good one, but personally I'd spend a bit more for the 32gb card then you know you've always got enough space if your needs change.
Click to expand...
Click to collapse
Oh yeah I just saw the feedback, how can I see if it's fake? I'd definitely return the card if it turned out to be fake..
I looked at his feedback and 2 people have said the cards were good

UrbanDesigns said:
Oh yeah I just saw the feedback, how can I see if it's fake? I'd definitely return the card if it turned out to be fake..
I looked at his feedback and 2 people have said the cards were good
Click to expand...
Click to collapse
People setup new accounts and build up a few hundred fake feedback pm more people are likely to buy from them, I mean I'm not saying by any means this is a scammer but just find another seller with feedback in the thousands to be more safe.
And the only way to tell if it's a fake is run a benchmark in your computer and check the card and packaging look real compared to pictures.

If you only want to watch movies a class10 is probably overkill. The problem is when you want to use the camera to record 1080p movies.
There is a difference between write and read speeds of flash memory like sd cards. They usually are pretty fast when it comes to reading but writing speed is another matter.
You should be fine with a good class4 card like one from sandisk.

shamez23 said:
If you only want to watch movies a class10 is probably overkill. The problem is when you want to use the camera to record 1080p movies.
There is a difference between write and read speeds of flash memory like sd cards. They usually are pretty fast when it comes to reading but writing speed is another matter.
You should be fine with a good class4 card like one from sandisk.
Click to expand...
Click to collapse
what about writing to my internal and copying over to my SD if I need to?

Writing from your internal to your external memory will be as slow/fast as writing from a cardreader to your sd card. Depending on the writing speed of said card.
When your sd card is too slow for direct 1080p recording your suggestion is a valid way to record those videos without lag. Record onto the fast internal memory and then move it to the slower external memory when you need space on the internal one. The sd card will still be fast enough to play the video.
Would be annoying if you had to do that a lot, though. If that's the case you should spend the extra money for a faster sd card.
I have no idea how fast that card has to be. I never had a device that can record in 1080p. However, I'm using an htc hd2 and run most of my apps(including games) from my sd card and in the beginning even the OS. I never noticed any stuttering or lag that didn't come from the OS itself. I've been using sandisk class2 for that and moved to a bigger sandisk class4 recently. No decernible improvement other than that it's a little faster to copy files from my computer to my phone and back, now.
Those cards are rather inexpensive nowadays, especially when we are talking about only 16GB. Don't think about it too much. Just buy one and try. If you have problems with the speed, use it as a flash drive and get a faster card for your phone.

UrbanDesigns said:
Ahh okay, I plan on watching movies and stuff I'll just go with the class 10 over the cheaper one I just wanted to know how it would affect phone use
I'm going to get this I think:
http://www.ebay.co.uk/itm/Sandisk-U...ain_3&hash=item4abb2020b8&_uhb=1#ht_500wt_969
16gb is more then enough for me plus the 11gb I have in my internal storage
Click to expand...
Click to collapse
I'm surprised noone has mentioned this yet. But do not buy that card. That auction is for a SDHC card, our phones are only compatible with Micro SD(HC) cards. If you buy that card, you will not be able to use it in your phone. You will need to find a Micro SDHC card.

To be honest I can't even see me using the 11GB you get on the phone unless it's music, an 8GB would do me just fine but I'm going to get the 16GB just in case, I'm only really getting one for rooting

UrbanDesigns said:
What's the difference between class? I see class 10 and class 4, class 4 is a lot cheaper then 10 but what's the actual difference? Does class 10 transfer files faster or something?
and also can anybody recommend a good screen protector? I had one come free with my case on eBay but it doesn't even fit the whole screen
Thanks all
Click to expand...
Click to collapse
Where are you located?

rudedog1979 said:
Where are you located?
Click to expand...
Click to collapse
I'm in the UK, and I've got a question about the trident case too.
It has a screen that you put over the front, does this mean I'll have to detach the case just to use the phone? The otterbox case looks great and well worth the money after seeing an anchor get dropped without leaving a mark on the case let alone the phone

UrbanDesigns said:
I'm in the UK, and I've got a question about the trident case too.
It has a screen that you put over the front, does this mean I'll have to detach the case just to use the phone? The otterbox case looks great and well worth the money after seeing an anchor get dropped without leaving a mark on the case let alone the phone
Click to expand...
Click to collapse
If you are in the UK, I think you should have a look to this people ebay, I buy everything from them, they now have a nice screen protector and various cases and battery covers (I personally take a lot of care of my phone), check this out:
http://www.ebay.co.uk/sch/monikaeshop/m.html?_nkw=&_armrs=1&_from=&_ipg=&_trksid=p3686
Have a special look at the carbon fiber cover and also the privacy screen protector....
Some pictures of my galaxy with them on :