Develop Bugs

[Q] Class 2? Class 10?

So I'm looking for SD cards for my vibrant. I'm wondering if I should be shelling out 100$ for a 16 GB Class 10 card or get the class 2 32 GB for the same price. Does anyone know if the phone might somehow be limited to certain file transfer speeds when connected via USB? I do intend to use the card for video and have all my apps on it. Thoughts?

From wikipedia:
The following are the ratings of some currently available cards:
Class 2: 16 Mbit/s (2 MB/s)
Class 4: 32 Mbit/s (4 MB/s)
Class 6: 48 Mbit/s (6 MB/s)
Class 10: 80 Mbit/s (10 MB/s)
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You might compromise and look for a class 6 -- i've seen a lot more class 6's than 10's so you might get a much better value from a class 6 purchase -- unless you need/want the fastest possible.

Lets just say I survived for a couple of years or whatever the time frame was running my apps off my G1 on a Class 6 card just fine.
Avatar runs fine on my SD card so I'd guess at least whatever that is if you are running video.

Thanks for the input, anyone actually have a 10 that they are using? A 6 is a viable option...
Sent from my Vibrant using XDA App

Class 4 is plenty fast. Class 10 imo for this phone is a waste of money. I got a class 4 16GB for $32.99 last weekend.

Go for a class 6, 10 is overkill and really intended for mass writes in the form of very high quality video or photos in quick succession.
~ infinityv ~

i have a 32 gb class2 and it plays my 720p .mkv videos just fine

Not all micro SD cards are made the same even if they say they are a given class. Stay away from eBay there are cases where people modify the firmware of the card and you get a card that is actually smaller or slower.
The best cards are name brands like Sandisk or Lexar. Transcend is also a very good brand and the tend to mark their card such that they always meet the spec but often read at higher speeds. Kingston is the name brand card that I have seen so far, but reviews on Newegg indicate that it's R/W performance isn't class 10 (<10MB/s). Some vendors interpret the class spec such that they say cards are class X if their peak read speed is X instead of their lowest R/W speed should not go below X.
I'd recommend getting a class 6 Transcend card (lifetime warranty). The sweet spot right now is 8GB class 6 for ~$20. Their 16GB is like ~$75 on Amazon.
Class 6 is good if you plan to run apps or put extended partitions / swap on it. That is what I did with my old G1. It is also a safe bet if your planning to record at 720p.
If you just need space for playing movies and music you can go for the cheaper 32GB cards. I'd pick a class 4 to be safe if your doing HD movies.

[Q] Will Evo accept any class (speed) SDHC card

I think I read somewhere that it takes the class 2 only, which is what I have on my current Sandisk 16gb card.
I have been looking at 32gb from Sandisk and they seem to be class 2 only.
However, I saw a Kingston card that says:
Compliant — with the SD Card Association card 2.00 specification (Class 4 & Class 6) and with the SD Card Association card 3.00 specification (Class 10)
Rating Write Speed SD Class
(Mbit/s)
13× 16.0 2
26× 32.0 4
40× 48.0 6
66× 80.0 10
I would assume faster is to prefer, but will it work?
and would this be a better option?

Yes. Sometimes, but you probably won't notice it.

I have an 8gb/class 10 and it works great. I don't know that I can tell the speed difference ... but mentally I feel SUPERIOR!

It should be able to handle any current class.
Sent from my PC36100

meatgel said:
I have an 8gb/class 10 and it works great. I don't know that I can tell the speed difference ... but mentally I feel SUPERIOR!
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Click to collapse
You're definitely of my kind
However, it seems like the snappier card is mainly an improvement if recording or watching Hi-res videos.
Besides, I'm not confident that the post is a legit chip (though poster probably believes so), alternatively that the specs are incorrect. Kingstons site only states 16gb class 10, not a 32gb class 10.
h**p://cgi.ebay.com/Kingston-32GB-Micro-SDHC-card-PLUS-Reader-/350387658622?pt=Cell_Phones
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Click to collapse

I just got a Ridata class 6. The phone turns on much faster and video playback is not choppy anymore. SD card speed test reports it as class 6.
Sent from my PC36100 using XDA App

32gb class2 or 16gb class6+ SDCARD

I'm trying to decide if i should go for space, or speed.
For those of you that bought 32gb cards, are they class2? and if so do apps and such run off it fine, playing movies?
Class 6 is much more fast, and a class6 16gb card is still half the price as a class 2 32gb card.
Just looking for guidance here, do we need more then class2 for our phones.
Plan on putting movies and apps and stuff on the card.

I have a 16GB class 2 card in my Cappy, and I can play 720p video off it without a single stutter, and I never did install the lagfix, so class 2 SHOULD be fast enough, depending on what you want to do with it.
But right now, the cost of the 32GB cards is, I think, prohibitive. It costs > 3x what I can get a 16GB card for, and thus far, I have not filled my card yet.

I would go with a faster speed for the bigger size card, class 2 would be too slow if you are read/write onto it constantly; For the best bang of your buck, the Polaroid 16GB microSD (made in Japan by PNY) from Frys is going for under $20 (after rebate); Even though it is labeled as a Class 2 card, but under most SD benchmark app, it is detected as a Class 4 card (4.5 MB/s Write/15 MB/s Read under the 300MB file R/W test in SD Card Speed Test)

I would rather take a 2GB class 6 over a 32gb class 2. Class 2 is so unbelievably slow its unbearable. I use my phone as a usb drive very often. In my previous phone I had an 8gb class 2. It was so slow I thought the card was broken. So I RMAed it and the new one was the same. I realized that it just takes like 8min/gb to transfer to it. (and no its not faster in this phone)
Class 4 is standard, anything less is a waste of silicon and plastic.
Class 6 is about as fast as your average-quick USB thumb drive.
Yes class 2 is fast enough to run programs and play back video, but you'll spend a lifetime transferring those things.
Not worth it IMO. Get an 8gb class6 if cost is an issue. Also, don't go with any crappy random manufacturers. I find that a class 6 from 'craptasticMEM' is nowhere near the speeds it should be, and in fact usually slower than a clas 4 I have from kingston.

The class rating has nothing to do with playback speed, only write speed. Copying files is faster, but how often are you loading up your SD card from your computer?
I am using class 2 and it is recording video just fine. I am not sure why above poster claims "class 4 is standard" - that would imply that class 2 is sub-standard. It is not, it just has slower write speed.
Keep in mind that if you lay out the big bucks for a class 6 32GB card today, it will half the price in a few months.
Now in my HD Camcorder it requires Class 6 to record 1080P - our phones have no such requirement, so anything above class 2 will help in initial data transfer from PC - after that you may never, ever see any benefit.

alphadog00 said:
... I am not sure why above poster claims "class 4 is standard" - that would imply that class 2 is sub-standard. It is not, it just has slower write speed.
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Yes, sorry you're correct. Class 4 is standard in my gauge of memory cards/usb drives. All the classes "should" perform fine. The higher classes are obviously faster (with significant brand to brand variation). I find that they are faster at everything though. Not just write, but read as well. A class 6 card is as smooth as the internal memory in the captivate. A class 2 card is abysmal at everything (in my experience). I say class 4 is standard because class 2 is really bad...

eatkabab said:
Yes, sorry you're correct. Class 4 is standard in my gauge of memory cards/usb drives. All the classes "should" perform fine. The higher classes are obviously faster (with significant brand to brand variation). I find that they are faster at everything though. Not just write, but read as well. A class 6 card is as smooth as the internal memory in the captivate. A class 2 card is abysmal at everything (in my experience). I say class 4 is standard because class 2 is really bad...
Click to expand...
Click to collapse
It could be my blindness - not physically, but the ignorance of not having a class 4 or 6 to compare to my class 2. My class 2 works fine for me, but if the class 6 stuff gets cheap I will head on over to it.

alphadog00 said:
It could be my blindness - not physically, but the ignorance of not having a class 4 or 6 to compare to my class 2. My class 2 works fine for me, but if the class 6 stuff gets cheap I will head on over to it.
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Click to collapse
My 32GB Class 2 reads/writes as smoothly as the internal card on the captivate as well.

locsplitter said:
My 32GB Class 2 reads/writes as smoothly as the internal card on the captivate as well.
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Click to collapse
lol no
internal is like class 10 i believe

locsplitter said:
My 32GB Class 2 reads/writes as smoothly as the internal card on the captivate as well.
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Click to collapse
its not healthy to lie

you guys are missing the fact that the class ratings are a MINIMUM rating. a lot of brands will perform MUCH faster than what they have printed on them. just saying something is class X is pretty much pointless. it's just a guideline that is being loosely followed. benchmark and move on

If your running apps off of your card than believe me there is noticable difference between a class 2 and a class 6, and yes dont go for a no name.
Sent from my SGH-T959 using XDA App

demize! said:
If your running apps off of your card than believe me there is noticable difference between a class 2 and a class 6, and yes dont go for a no name.
Sent from my SGH-T959 using XDA App
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Click to collapse
I don't believe you. It 100% fully depends on the card. Some class 2's are faster than class 6's. Ratings are lies.... benchmark ftw!

True that. Ive found significant differences by brand. However, there is definitely a noticeable difference between a class 2 and a class 6 card.
What you get depends on personal requirements more than anything else. Faster or more storage?

[Q] Micro SD, which one?

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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Click to collapse
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).
Click to expand...
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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Click to collapse
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.

Suitable Memory Card???

I am planning to buy a memory card for my Galaxy 3.
I already have a Class 2 8GB card which I will give to my father.
So I was looking for a better memory card this time.
I have following 3 options right now.
8 GB class 10 : Rs 700/-
16 GB class 6 : Rs 1100/-
32 GB class 4 : Rs 1950/- (Probably not worth it)
I was actually looking for 32 GB class 10 within 2000 but not available. or even if it is available, It wont be affordable for me.
I would like some developers like Dharam, Hillbeast, Naveen or Kyrillos to suggest me what should I go for.
I am planning to use 2GB a2sd partition & 256MB swap on it.
How about Class 6 performance? Would I miss something if I go for the 16GB card?
Meaning, do I really need a class 10 card for a2sd and swap?
If anyone from India can direct me to some better deals than above 3 then I would be thankful.
Sent from my GT-I5801 using XDA App

pednekar.mohan said:
I am planning to buy a memory card for my Galaxy 3.
I already have a Class 2 8GB card which I will give to my father.
So I was looking for a better memory card this time.
I have following 3 options right now.
8 GB class 10 : Rs 700/-
16 GB class 6 : Rs 1100/-
32 GB class 4 : Rs 1950/-
I was actually looking for 32 GB class 10 within 2000 but not available. or even if it is available, It wont be affordable for me.
I would like some developers like Dharam or Kyrillos to suggest me what should I go for.
I am planning to use 2GB a2sd partition & 256MB swap on it.
If anyone from India can direct me to some better deals than above 3 then I would be thankful.
Sent from my GT-I5801 using XDA App
Click to expand...
Click to collapse
Get the 8GB class 10 card.

32 GB class 4

anxdateamcool said:
32 GB class 4
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Click to collapse
Worst choice. The sd card is slow so app2sd will be slow and you won't even use 32GB of space. Class 10 is fastest so you will be fine since you want to partition 2GB
Sent from my GT-I5800 using XDA App

pednekar.mohan said:
I am planning to buy a memory card for my Galaxy 3.
I already have a Class 2 8GB card which I will give to my father.
So I was looking for a better memory card this time.
If anyone from India can direct me to some better deals than above 3 then I would be thankful.
Sent from my GT-I5801 using XDA App
Click to expand...
Click to collapse
I bought a samsung 8 GB class 6 microsd card from ebay-dot-in for around 500 Rs.It does not seem to lag, but sdtools my transfer speeds are 6 Mbps read and 4 Mbps write, which is the same as what i was getting earlier with a class 4 verbatim. These speeds were checked after setting the buffer to 2048 KB.
Bobby

bobbyprajan said:
I bought a samsung 8 GB class 6 microsd card from ebay-dot-in for around 500 Rs.It does not seem to lag, but sdtools my transfer speeds are 6 Mbps read and 4 Mbps write, which is the same as what i was getting earlier with a class 4 verbatim. These speeds were checked after setting the buffer to 2048 KB.
Bobby
Click to expand...
Click to collapse
I think our phones have a certain limit on SD card read and write speeds

bobbyprajan said:
I bought a samsung 8 GB class 6 microsd card from ebay-dot-in for around 500 Rs.It does not seem to lag, but sdtools my transfer speeds are 6 Mbps read and 4 Mbps write, which is the same as what i was getting earlier with a class 4 verbatim. These speeds were checked after setting the buffer to 2048 KB.
Bobby
Click to expand...
Click to collapse
well...hillbeast said that speed of sdcard is like that because of JIT is being enabled in custom rom's.... ...and i have 8Gb class 10 Verbatim sdcard and I'm using hybridata2sd....everything runs smoothly
Sent from Galaxy
Kyrillos' 9.3
powered by
G3mod 2.2.2 OC

Class 6... Interesting...
bobbyprajan said:
I bought a samsung 8 GB class 6 microsd card from ebay-dot-in for around 500 Rs.It does not seem to lag, but sdtools my transfer speeds are 6 Mbps read and 4 Mbps write, which is the same as what i was getting earlier with a class 4 verbatim. These speeds were checked after setting the buffer to 2048 KB.
Bobby
Click to expand...
Click to collapse
I feel like I need the 16 GB class 6.
btw I am getting 6 Mbps read 5 Mbps write (buffer = 4096 KB) on class 2 Transcend. Isn't that weird??? (I actually opened up to see. It is class 2 indeed!!)

Dont go for 32 gb - You are phone will get hang up
Use how much you required .I guess 16Gb is sufficient