Develop Bugs

What MicroSD are you using?

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?

[Q] MicroSD card...is this a good deal?

Hello people,
I just came across this microsd card deal:
http://mobile.dailysteals.com/Default.aspx
this is samsung 16 gb class 2 micro sd card. But I am not sure if this is a good deal or not? can anyone tell me ?
Thank you,

Class 2 cards are SLOOOOW! I'd much rather spend a few bucks and get a faster one. I wouldn't get anything less than class 6, and usually go for the class 10 cards. Basically, the speed for a class 2 card is 2 MB/s, a class 6 is 6 MB/s, and so on.

bknust said:
Class 2 cards are SLOOOOW! I'd much rather spend a few bucks and get a faster one. I wouldn't get anything less than class 6, and usually go for the class 10 cards. Basically, the speed for a class 2 card is 2 MB/s, a class 6 is 6 MB/s, and so on.
Click to expand...
Click to collapse
Yes that is what I read somewhere. Just wanted to confirm. Thanks for helping me out.
Sent from my SAMSUNG-SGH-I897 using XDA App

Classes only apply to minimum write speed, not read speed, which is far more important.

JPS81 said:
Classes only apply to minimum write speed, not read speed, which is far more important.
Click to expand...
Click to collapse
Right: a Class 2's and a Class 6's speed-differences will only be apparent when copying files to the SD card from the PC.
Samsung 16GB C2 MicroSD
Subtotal : $14.99
Shipping Charges : $4.99
Total Charges : USD$19.98
Yes, that is a good deal. I paid USD$28 for my Sandisk just yesterday, and that was the best deal I could find (on eBay). Mine did come with a USB-reader, though.

waghoba said:
Yes that is what I read somewhere. Just wanted to confirm. Thanks for helping me out.
Sent from my SAMSUNG-SGH-I897 using XDA App
Click to expand...
Click to collapse
Don't be fooled into buying a card on class speed alone - 16gb and 32gb class 6 are very pricey. If you mostly store movies and music on your SD card a class 2 is fine. Even for recording video on the phone, class 2 works fine.
If you are wiping your SD card or filling it with new data all the time, then maybe you want faster write speed - but I would rather save my $$$ for now. The same class 6 cards will be half price in a few months.

alphadog00 said:
Don't be fooled into buying a card on class speed alone - 16gb and 32gb class 6 are very pricey. If you mostly store movies and music on your SD card a class 2 is fine. Even for recording video on the phone, class 2 works fine.
If you are wiping your SD card or filling it with new data all the time, then maybe you want faster write speed - but I would rather save my $$$ for now. The same class 6 cards will be half price in a few months.
Click to expand...
Click to collapse
PhrProfess said:
Right: a Class 2's and a Class 6's speed-differences will only be apparent when copying files to the SD card from the PC.
Samsung 16GB C2 MicroSD
Subtotal : $14.99
Shipping Charges : $4.99
Total Charges : USD$19.98
Yes, that is a good deal. I paid USD$28 for my Sandisk just yesterday, and that was the best deal I could find (on eBay). Mine did come with a USB-reader, though.
Click to expand...
Click to collapse
JPS81 said:
Classes only apply to minimum write speed, not read speed, which is far more important.
Click to expand...
Click to collapse
Thank you for all of you for your replies...but unfortunately the deal was gone by the time I decided to buy
Now waiting for next best deal, at least now I know that just for storing music and vids class 2 is fine !

Go over to G1 forum and search this. Not sure what our phone's max read/write speed is but I am sure its similar to HTC devices- Class 6. You can spend the money on the class 10 but its useless for mobile devices.
Also, some say its only for pc -read/write- not 100% true. however, maybe for our particular phone....
For example- on the dream you can use your SDcard as a swap file placing an EXT2/3/4 partition on it. The class 6 has better performance and longer life than a class 2- i dont recall why exactly but you can easily google it. It was something about after so many read/writes it will burn out the SD but there is more technical factors to it. It has to do with bit allocation and spreading the writes over the card as to continual writing to the same spot- IIRC(dont quote me on that I havent thought about this in a looong time). Now, as this pertains to our devices- well it doesnt really since we dont utilize SDCard swap files and such for our devices. So talking in a circle, I guess for our situation it does only relate to PC writes..

^o hai thx

malfuncion said:
Go over to G1 forum and search this. Not sure what our phone's max read/write speed is but I am sure its similar to HTC devices- Class 6. You can spend the money on the class 10 but its useless for mobile devices.
Also, some say its only for pc -read/write- not 100% true. however, maybe for our particular phone....
For example- on the dream you can use your SDcard as a swap file placing an EXT2/3/4 partition on it. The class 6 has better performance and longer life than a class 2- i dont recall why exactly but you can easily google it. It was something about after so many read/writes it will burn out the SD but there is more technical factors to it. It has to do with bit allocation and spreading the writes over the card as to continual writing to the same spot- IIRC(dont quote me on that I havent thought about this in a looong time). Now, as this pertains to our devices- well it doesnt really since we dont utilize SDCard swap files and such for our devices. So talking in a circle, I guess for our situation it does only relate to PC writes..
Click to expand...
Click to collapse
Hey that's a lot of technical information, but thanks. Now I understood that the class doesnt really matter. So next time if any good deal is out I will just jump on it.
Sent from my SAMSUNG-SGH-I897 using XDA App

16 Gb Micro Sd class 10

I wanted to let anyone looking for a micro sd about a deal i found. I found a Patriot Memory 16gb micro sdhc class 10 for $39.99 on www.CompUSA.com I think i'm going to order one after reading here on xda that patriot makes a pretty reliable sd card. I haven't ever used a patriot memory product so i only know what guys on here have posted. anyone make sure you check into the company on your own. They have the wintec 32 gb class 10 for $84.99 too!

apparently class10 cards are no good for phones, take a look at this link

yeah you dont want to spend all the money on something that might not work right?

I had read here on xda that the class of the sd card doesn't matter but the size(gb) is what matters with phones. like my SE X10 is only compatible with up to 16gb of external memory. Is that not correct? Can anyone clear this up for me?

X10's are compatible with up to 32gb microSD cards, I've got one in mine.
The size is important as you want to buy an SD card that works for the content that you intend on putting on it. If you have a lot of MP3s and videos, take a lot of pictures and shoot a lot of videos then obviously you are going to want at least a 16gb SD card.
The class does indeed matter. If you have hundreds or thousands of images then a class 2 card would take ages for them to all load in the Gallery. Or if you use App2SD at all a class 2 card wouldn't be able to keep up with the reading and writing and the app would be sluggish.
A class 10 card in my opinion is a bit excessive, I'd personally go for a class 4 or 6.

Pawnty said:
X10's are compatible with up to 32gb microSD cards, I've got one in mine.
The size is important as you want to buy an SD card that works for the content that you intend on putting on it. If you have a lot of MP3s and videos, take a lot of pictures and shoot a lot of videos then obviously you are going to want at least a 16gb SD card.
The class does indeed matter. If you have hundreds or thousands of images then a class 2 card would take ages for them to all load in the Gallery. Or if you use App2SD at all a class 2 card wouldn't be able to keep up with the reading and writing and the app would be sluggish.
A class 10 card in my opinion is a bit excessive, I'd personally go for a class 4 or 6.
Click to expand...
Click to collapse
nice info....

how do i know
I have3 a 16 Gb SD card... and I recently bought 2 16 GB sd cards 4 a x10 mini and a sam 5560... but both haven´t the blister. so how do I know (with an android app) which class are they... even mine... because was a operator gift.
I tried with SD tools... but even in that app ask me what class is my card... so bad...
can u help me?
thnks
salu2

Pawnty said:
X10's are compatible with up to 32gb microSD cards, I've got one in mine.
The size is important as you want to buy an SD card that works for the content that you intend on putting on it. If you have a lot of MP3s and videos, take a lot of pictures and shoot a lot of videos then obviously you are going to want at least a 16gb SD card.
The class does indeed matter. If you have hundreds or thousands of images then a class 2 card would take ages for them to all load in the Gallery. Or if you use App2SD at all a class 2 card wouldn't be able to keep up with the reading and writing and the app would be sluggish.
A class 10 card in my opinion is a bit excessive, I'd personally go for a class 4 or 6.
Click to expand...
Click to collapse
This is very true. I have a class 2 card and loading thumbnails for artists/albums is painfully slow in mediascape. I would go for a 32 GB if you are a music fan. I have a 1800 songs on my X10 and its already full. Class 4/6 should be good, class 10 is a little excessive.

georgegon60 said:
I have3 a 16 Gb SD card... and I recently bought 2 16 GB sd cards 4 a x10 mini and a sam 5560... but both haven´t the blister. so how do I know (with an android app) which class are they... even mine... because was a operator gift.
I tried with SD tools... but even in that app ask me what class is my card... so bad...
can u help me?
thnks
salu2
Click to expand...
Click to collapse
Just take the card out of the phone. There should be a 'C' printed on the card and there will be a number inside the 'C'. This is the class of your card.

I was using stock 8 GB class 2, I brought Team 16 GB class 10. Difference in performance is noticeable.

I have a class 10 8gb card and it works way better than the stock card.
Just make sure you tweak your read_ahead_kb.. Search for SD card speed improvement or speed increase.

In general, Class 4 or 6 are good enough for the application usage by phone, such HD video and phones.
I tested my Class 4 sd card, it able to transfer ~5.5mb / sec, not bad.
Yes, when price come down, I will get a Class 100 sd card too.
cheers

I'd rather the class 200.
Sent from my X10i using XDA Premium App

Class 10 significantly improves the performance.
Honestly it does not matter if someone is using the SE stock rom...however since I have tried the awesome ROM created by wolfbreak...my apps stored in sd was very sluggish...had to buy a class 10 16 gig to improve the performance...

Just got a 16Gig class 4 card...goto to play with data2sd and see the quadrant!!!!!!

kxhawkins said:
I'd rather the class 200.
Sent from my X10i using XDA Premium App
Click to expand...
Click to collapse
LOL
Sent from my X10i using XDA Premium App

Is there maybe an app or system menu which I could use to determine the class of my microsd card?

donnytuco said:
apparently class10 cards are no good for phones, take a look at this link
Click to expand...
Click to collapse
If you get a real kingston class 10 you will get five times the speed of a low spec class 2 generic sd card.
Rollhard said:
I had read here on xda that the class of the sd card doesn't matter but the size(gb) is what matters with phones. like my SE X10 is only compatible with up to 16gb of external memory. Is that not correct? Can anyone clear this up for me?
Click to expand...
Click to collapse
Real Class 10 SD cards work at 10MB/s of data transfer speed.
Class 2=2MB/s
Class 4=4MB/s
Class 6=6MB/s
Class 8=8MB/s
Class 10=10MB/s
The best are as said by others Kingston and Sandisk.
I've a Sandisk class 6 card and i get near 5,5MB/s of data transfer.
Mine is still 8gb, i want to buy another but in Brazil it's very expensive, the taxes are very high.

Got the Wintec Filemate 16gb class 10 for just under $40 at Frys Electronics and it's given me no problems. Used it in my NookColor running tons of apps and music from it without a hitch. Now it's in my X10 and with using the SD Speed Up tools, it helped alot.
http://forum.xda-developers.com/show....php?t=1028465

arcturusx said:
Is there maybe an app or system menu which I could use to determine the class of my microsd card?
Click to expand...
Click to collapse
Just take it out and look at at.
There will be a letter C with a number in it....that will be the class of the card

[Q] Anyone here use a Class 10 SD card for Android?

I'm looking to upgrade the crummy 1GB SD card in my wife's TP2 to something faster. I was wondering if buying a class 10 card was worth it or if I should just stick with a class 6 or lower. Does the SD slot in the TP2 even support a class 10 card? Would a class 10 card be noticeably faster than a class6?

Not for this project. IIRC Nate said class 4 seems to be the sweet spot, the higher the class the worse it would be running XDandroid, but even some class 4's work better than others. Walmart has 16G class 4 sandisks for around $20, not too bad if you ask me

benutne said:
I'm looking to upgrade the crummy 1GB SD card in my wife's TP2 to something faster. I was wondering if buying a class 10 card was worth it or if I should just stick with a class 6 or lower. Does the SD slot in the TP2 even support a class 10 card? Would a class 10 card be noticeably faster than a class6?
Click to expand...
Click to collapse
C10 cards are supported, but some have had issues. I would not recommend a C10 card for Android use. I doubt the phone itself will be any faster...

fishingmedic said:
Not for this project. IIRC Nate said class 4 seems to be the sweet spot, the higher the class the worse it would be running XDandroid, but even some class 4's work better than others. Walmart has 16G class 4 sandisks for around $20, not too bad if you ask me
Click to expand...
Click to collapse
Ah, OK. I'll grab a class 4 from Newegg then. I was looking at a class six.

arrrghhh said:
C10 cards are supported, but some have had issues. I would not recommend a C10 card for Android use. I doubt the phone itself will be any faster...
Click to expand...
Click to collapse
Cool. Thanks. So get a class 4 then? Is it worth it to get a 16 over a 8GB? My wife doesn't put much on her phone really and she streams all of her music.

Yeah I've got a Patriot 16Gig Class10 SD card that I picked up on sale months ago. I have been running XDAndroid on it since then and haven't noticed any benefit over my old 4gig class 2 card.
Not sure if it's related to running andriod but at first I was having issues with the card corrupting and losing all data on it, having to format it to be usable again. Formatting a few times with the HP tool seems to be helping.
I had a similar issue with my last phone (HTC Hermes) which would only work with good quality (Sandisk) SD cars, and failed with cheap chinese flash memory. The issue was that the phone wasn't able to remount the card properly in winmo when coming out of sleep, and the filesystem would become corrupt pretty quickly with folders disappearing and files having wacky filenames. Sounded like it was more of a hardware issue than anything.

benutne said:
Cool. Thanks. So get a class 4 then? Is it worth it to get a 16 over a 8GB? My wife doesn't put much on her phone really and she streams all of her music.
Click to expand...
Click to collapse
Yea I use a class 4 card. Some have reported oddness with class 6, so it seems like the type of card matters as well... Because others with C6 cards say they work just fine. I've even had some people say C10 cards are fine, but most seem to have issues with C10 cards. Don't get some cheap knockoff, get a name brand.
As for size, that's entirely up to you. You can have up to a 32gb card. 512mb minimum .

ReeS86 said:
Yeah I've got a Patriot 16Gig Class10 SD card that I picked up on sale months ago. I have been running XDAndroid on it since then and haven't noticed any benefit over my old 4gig class 2 card.
Not sure if it's related to running andriod but at first I was having issues with the card corrupting and losing all data on it, having to format it to be usable again. Formatting a few times with the HP tool seems to be helping.
I had a similar issue with my last phone (HTC Hermes) which would only work with good quality (Sandisk) SD cars, and failed with cheap chinese flash memory. The issue was that the phone wasn't able to remount the card properly in winmo when coming out of sleep, and the filesystem would become corrupt pretty quickly with folders disappearing and files having wacky filenames. Sounded like it was more of a hardware issue than anything.
Click to expand...
Click to collapse
I have a Patriot 16GB C10 card here too, but I no longer use it. It was constantly getting corrupted, the kernel logs were filled with I/O error messages. I'm now on a Sandisk 32GB C4 card and no more problems.

highlandsun said:
I have a Patriot 16GB C10 card here too, but I no longer use it. It was constantly getting corrupted, the kernel logs were filled with I/O error messages. I'm now on a Sandisk 32GB C4 card and no more problems.
Click to expand...
Click to collapse
What about Kingston? There are a lot of those available at Newegg.

benutne said:
What about Kingston? There are a lot of those available at Newegg.
Click to expand...
Click to collapse
Just don't get a C10 card... I think that's what people should take away from this.
Some have said C10 cards are fine, but most say they are not. A few have had issues with C6 cards, but most say those are OK. I've never heard of people complaining about C4 or below cards - hence the reason I recommend anything C4 or less.

c10 sd android
My company name is WinDroidz and all I do is mod android and windows devices... and I have always seen huge performance gains with c10 cards, c2 sucks major, its just the transfer speed the card can move data at and clearly more speed no matter how u look at it with an SD card. Is crucial... I always used patriot c10, or topram and pqi c6 cards for android SD on windows devices and have only seen a posative result.. this is based on my personal experience of Modding more Devices then I can remember.... not from what I read somewhere or was told by someone... SD card data transfer is the slowest method of data transfer of all other common used methods... there are graphs if u Google it that show sdhc c2 cards lined up against other transfer methods like USB, ide, sata etc..... to put in perspective how ridiculously slow SD cards really are, once u see that u will understand why your phones drags ass so much when trying to pull up gallery after cache has been wiped if you have a ton of pics etc.... so if u are having problems with a higher class SD its probly not the SD and is something else you are doing, or maybe the brand as I can only vouch for the ones I've used... (wouldn't care personally about brand as pretty much everything is same manufacturer with restamped brand and packaging.. Kingston is Japan... currently using a c4 Kingston 32gb in my desire HD (wish it was a c10 but kinda pricey for that size and brand) I recommend c10 8gb for $30 on Amazon if u are using some kind of android SD rom.. or any device if u want better transfer speeds and it is very noticeable... no matter what speed u get though it will never run like nand android.. like HD2. So lets just hope the nand development for other devices continues like clk or magldr did for hd2 cause the hd2 with clk and full rom manager support is amazing

16GB class 10
Using 16GB class 10 and have had no problems related to the card, with FRX07.
I personally cannot think of any logical reason why a class 10 card of good quality should ever be a problem.
I just installed and ran Angry Birds Rio. It is slow, but works. Kind of fun to play in slow-mo!

i use 8gb c6 and haven't had any problem so far.

My 16GB RiDATA Class 6 Micro SD has been great, no problems.

Maximum size sd card with g2

Bought a 32 gb micro class 10 today and its acting really weird. Still have my 16gb and it works perfect.
Running stock 2.2 still, is 16gb max or what? If yes and I upgrade to 2.3 legit upgrade will it work with a 32 gb?
Sent from my T-Mobile G2 using XDA App

No, it's the class 10. Lot's of threads on this, try a class 6 card.

Class 10 is not so good on desire z. Try a class 4 or 6 card
Sent from my HTC Vision using XDA App

Ok so... I bought another one with a class 4.
Class 10 no name: everything works normal but transfer is super super super slow...
Class 4 kingston: weird when I open my computer and turn on the usb connection the H drive (sd card) keeps showing up and disappearing then showing up and disappearing over and over... wtf gives?
Sent from my T-Mobile G2 using XDA App

ok so im throwing both the sd cards in the reader and formatting them. see if that fixes my problem.

if you still got the packaging and recipt you can still return the cards if they dont work

I'm running a 32GB Class 10 card with no problems. Maybe it's just your card. I had problems with the partitions on my original Wintec card and the company sent me a new one as a replacement.

blackknightavalon said:
I'm running a 32GB Class 10 card with no problems. Maybe it's just your card. I had problems with the partitions on my original Wintec card and the company sent me a new one as a replacement.
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Ya, thats the one. Finished formatting and copying files to the cards. The Wintec one which is class 10 is running a little bit weird. I'm try the kingston class 4

evilcuber said:
Class 10 is not so good on desire z. Try a class 4 or 6 card
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Click to collapse
I have 16GB Class 10 Joyflash (noname). Could you tell, why Class 10 "is not so good on desire z", becouse I dont understand this.
If card reader of desire is slow, on level of Class 6, if you put Class 10, doesnt change anything, but why "is not so good"?

I can safely say that my 32 GB class 6 has no issues. I've been reading on the subject and for some devices the class 10 is flaky... might just be a firware/software issue. Who knows.
But I'm ok with my class 6. Write: 9mb/s and read 24.3m/s

Ok so after everything last night I ended up keeping the kingston class 4 instead of the wintec class 10.
One thing that everyone should know if they are planning to upgrade soon and have forgotten this. The speed to write to a micro sd is slow then the speed to copy from a micro sd. This is my experience last night at least... I can copy a certain file to my desktop in 40 seconds but to put it on took 2-3 minutes.
Anyways, just be patient and go to a place you can get refunds so you dont get screwed with a bad card lol. With my experience the 32 gb class 10 wintec sucks, the write speed was insanely slow. So I stuck with a name brand instead, I really wanted a sandisk but they werent available.

Mog said:
Ya, thats the one. Finished formatting and copying files to the cards. The Wintec one which is class 10 is running a little bit weird. I'm try the kingston class 4
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Click to collapse
Actually, my original Wintec card was screwing up and wouldn't keep the data partitions written. The replacement I got from Wintec is working the way it should, and it actually is acting like a class 10 card.

Mog said:
One thing that everyone should know if they are planning to upgrade soon and have forgotten this. The speed to write to a micro sd is slow then the speed to copy from a micro sd. This is my experience last night at least... I can copy a certain file to my desktop in 40 seconds but to put it on took 2-3 minutes.
Click to expand...
Click to collapse
Class ratings refer only to write speed. And write speed is always going to be slower than read speed.

redpoint73 said:
Class ratings refer only to write speed. And write speed is always going to be slower than read speed.
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Click to collapse
This AND, class ratings were documented before smartphones for the purpose of professional photography use in cameras. I have never had any speed issue with my good old class 2 card in my smartphone.

iDAREK said:
I have 16GB Class 10 Joyflash (noname). Could you tell, why Class 10 "is not so good on desire z", becouse I dont understand this.
If card reader of desire is slow, on level of Class 6, if you put Class 10, doesnt change anything, but why "is not so good"?
Click to expand...
Click to collapse
Lots of threads on this, search "sd card"
http://forum.xda-developers.com/showthread.php?t=804421&highlight=sd+card
http://forum.xda-developers.com/showthread.php?t=849494&highlight=sd+card
Also, check this out...
http://forum.xda-developers.com/showthread.php?t=1022678&highlight=sd+card

SuperDave81 said:
No, it's the class 10. Lot's of threads on this, try a class 6 card.
Click to expand...
Click to collapse
Thank You: I can confirm this.
I had to put a SD in my old DesireZ/Vision for one of my son (10 years... there's no religion....) to replace a old 4GB crashed one.
The phone is running SenseI ROM (fine ROM: a very good way to replace the stable CM7 and run ICS 4.0)
I bought on Amazon Samsung EVO uSD 16GB Class10... and it was not recognized... So I read it on the PC to see if is was good or not: it was OK!
Recovered the trouble upgrading the Galaxy S2 of the other son from a old 8GB class 4 (probably Kingston o Transcend) to the brand new 16GB EVO Class 10, and putting the old 8GBB in the Desire Z: quickly recognized and optimally mounted both cards over both the 2 phones!
But I was disappointed... more than speed performance I thought that Class 10 memory card were also better on quality, due to a more robust and stable architecture of the chips inside.... and
much more recommended for the "systemdisk-like" use on Android Smartphones!