Develop Bugs

Do i NEED a Class 6 Micro SDHC Card

Hello all,
Ive got a spare 16GB Micro SDHC card which i have swapped for the stock 2GB version that came with the Desire, but it is only a Class 2.
Having read that its best to use Class 6, should i shell out £50 for a new one, or will i not notice a difference in class ?

Dunno - I'm using a class 2 16gb card myself and I don't notice much slowdown if at all. I'm surprised these things haven't come down in price after two years... key thing is do you notice any slowdown with apps that access the SD card? like I say, I haven't thus far...
Sent from my HTC Desire using the XDA mobile application powered by Tapatalk

i read somwhere that class 4 is enough coz the phones do not support hihger speeds. class 6 will help you if you will take card to the card reader straight to the computer... it think

hot-fuzz said:
... Having read that its best to use Class 6 ...
Click to expand...
Click to collapse
Where have you read that, please?

tomeeq12 said:
i read somwhere that class 4 is enough coz the phones do not support hihger speeds. class 6 will help you if you will take card to the card reader straight to the computer... it think
Click to expand...
Click to collapse
Thats what i ......... think. Im sure it only matters if its connected to the PC, and in that case i dont care.
I read it on another forum that i wont link too
Class 6 are almost double the price of Class 2.

You don't NEED to get one, I did use a Class 2 card for a few days and didn't have any problems.
Personally I am using a Class 6 now, as I regularly transfer a lot of big media files onto the card, so the extra speed is worth it for me.
If you don't fancy forking out though, you don't have to.

I totally agree, My desire came with a 4gb sandisk class memory card which I initially assumed was class 4 until I took the card out yesterday...connecting the desire to my pc and switching to usb drive mode, i am able to transfer my movies etc to the memory at +/- 8Meg per sec which is more than adequate enough for me...I was about to get a 16gb one but was thinking of getting the class 6 one until i discovered the one I currently have is class 2, so I just made up my mind and went for a class 2 16gb, saved me money....

They only refer to the write speed of the card, i came from a 8gb class 6 and now have a 16gb class 2 and notice no difference, only difference is the write speed from pc to card.
Even though i got a class 2 i still see 4-6mb/s so happy enough with that.

I have a class 10 16Gb card in phone. Read and write speeds seem to be limited to around 8Mb per second (copying uncompressed music). Using an adapter, the computer is able to copy at 14Mb+ using the same card.

They just seem a big outlay for nothing to me, lets face it the only big write time is when you transfer everything across from your previous card once the stuff is on there the write times really won't be much of a problem.

The main reason you will find people suggesting class 6 and above SD cards is due to "Apps to SD". For the Newbies "Apps to SD" or A2SD is a modification that has been done on most android phones (though not the desire at time of writing) which allows the Apps you download to be stored on the SD card rather than the phones limited internal memory. I am not sure if it makes a huge difference to the faster processor phones, but in the G1 days it was noticeable. For just moving music and pictures about it isn't really important to have a faster card and we may have to wait a while for A2SD anyway. I will pop over to the N1 forum and see if they can shed some light on this.

Anyone using a microSD 16GB Class 4, if so are they any good? I'm looking at buying one for the Desire. Also where's the best place to get a deal on one of these card?

I want a 32GB memory card; questions regarding installation

Which 32gb card should I get? I heard there are classes for each.
When I buy one, what is the best method that I should transfer my data from the 8 GB one to the new one?
Is there anything else important that I have to know like reformatting the new card before using it? Will the phone do that already?
Thanks!

I doubt they have the faster classes yet. The 8gb that came with the Evo is a class 2, and for most people that's fine. If you have unusually high bitrate MP3s or something, you might run into issues with a class 2, but you should probably be fine.
Most of the higher class cards are made for cameras and such. RAW on DSLRs are like what, 50+ mb files? You need a fast memory card to be able to take more than one shot at a time.
I always move things from a smaller card to a bigger one via my PC and copy and paste. I usually set up a folder on the desktop, copy into there, then copy that out into the new card. You get a nice backup of your card that way too.
You shouldn't need to do anything special to install the card, just pop it in. If you just copy and paste like I do, the phone won't miss a beat, all your ringtones and stuff will show right back up.

Check Verizon, They were having a spexial, 95 bucks for a scandisk class 2 works fine for all but hiher bitrate stuff. Beware of cheap ones on ebay and such, thay are almost always fakes.
Evo Sent

As far as transfering, copying the whole thing to your pc and back to the new card will be fine.
If you want to be careful about it, snag a windows app that will generate md5 hashes recusively and check on card then on disk and then on new card.
Sent from my PC36100 using XDA App

Thanks all.

Borg1982 said:
Which 32gb card should I get? I heard there are classes for each.
When I buy one, what is the best method that I should transfer my data from the 8 GB one to the new one?
Is there anything else important that I have to know like reformatting the new card before using it? Will the phone do that already?
Thanks!
Click to expand...
Click to collapse
Only Class 2 32GB microSDHC exists.

Go with the Kingston 16 GB Class 10
http://www.amazon.com/Kingston-Micr...?s=electronics&ie=UTF8&qid=1281321236&sr=1-12
When I added my card I just formated it and put it in and it works fine. Not sure if I had to copy files from the old one but every thing works fine.

rhconcepts said:
Go with the Kingston 16 GB Class 10
link
When I added my card I just formated it and put it in and it works fine. Not sure if I had to copy files from the old one but every thing works fine.
Click to expand...
Click to collapse
ordered mine on friday, cant wait for it arrive this week sometime
(i wasnt allowed 2 post a link here since im a new user, but buy the 1 from etech, ull save about $8 over the link above...)
i got it for $99.98 including tax+shipping, etc... it also comes with the adapter...

rhconcepts said:
Go with the Kingston 16 GB Class 10
http://www.amazon.com/Kingston-Micr...?s=electronics&ie=UTF8&qid=1281321236&sr=1-12
When I added my card I just formated it and put it in and it works fine. Not sure if I had to copy files from the old one but every thing works fine.
Click to expand...
Click to collapse
I got this card and I was disappointed in it's performance. I downloaded an SD speed tester from the market and tested my stock 8gb class 2 card and got around 1.75mb/s write time and around 2.5mb/s read time. With the 16gb class 10 (as above) I got marginally better results; 2.28mb/s write and 3.42mb/s read. Better, yes, but I probably would have gotten the same with a class 6 and maybe even a class 4. *shrug* These are only my experiences, maybe you'll have better luck.

jerryparid said:
Only Class 2 32GB microSDHC exists.
Click to expand...
Click to collapse
http://www.buy.com/prod/3c-pro-32gb...ss-4-with-sd-adapter/q/loc/101/216378749.html ?
http://www.buy.com/prod/topram-32gb...card-class-4-with-sd/q/loc/101/216378751.html ?

spiicytuna said:
I got this card and I was disappointed in it's performance. I downloaded an SD speed tester from the market and tested my stock 8gb class 2 card and got around 1.75mb/s write time and around 2.5mb/s read time. With the 16gb class 10 (as above) I got marginally better results; 2.28mb/s write and 3.42mb/s read. Better, yes, but I probably would have gotten the same with a class 6 and maybe even a class 4. *shrug* These are only my experiences, maybe you'll have better luck.
Click to expand...
Click to collapse
it may also be the it isn't the card that is the bottleneck, could be the r/w of the phone. if it can't write that fast, then having a fast card isn't going to do anything but sit there wasted.

My 16gb class to write speed was 7mb read 4mb on my evo
Sent from my PC36100 using XDA App

What class is the default EVO 8 GB card?

timothydonohue said:
it may also be the it isn't the card that is the bottleneck, could be the r/w of the phone. if it can't write that fast, then having a fast card isn't going to do anything but sit there wasted.
Click to expand...
Click to collapse
That is exactly my point. The op + others could save money by going with a cheaper card. I found out I have a 4gb class 4 at home, so I will test that tonight to see what its throughput is and post back here.
Sent on the go from my HTC EVO

martyzidek said:
My 16gb class to write speed was 7mb read 4mb on my evo
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
Which program are you using to benchmark?
Sent on the go from my HTC EVO

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.
Click to expand...
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] 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.

32g microsd

I bought a 32g microsd class10,but the problem is when i try to pass all my files from my other microsd,there a missing files like clockworkmode,and i cant open some of my pictures,i put the micro sd in my inc2 and download the clockworkmode from alpharef or rom manager and i can see the file but incomplet also if i try to pass my stock rom i can see the process but whn i open the clockworkmode and look in the save file there not any stock rom in there,if try to go in to recovery mode dont let me jist reboot and i have to select reboot.if ltry to save my current rom using rom manager its look like is doing something but the download bar dont do nothing,and then i check the saved rom and its in the file but imcomplite i dont know what to do with....thanks...

What is the brand on the card? It may look good, at 32gb class 10, but if its not from a decent manufacturer it may not be worth the small price you paid.
Personally, I stick with pny or sandisk.
Sent from my DInc2

Try formatting the card.

FC127 said:
What is the brand on the card? It may look good, at 32gb class 10, but if its not from a decent manufacturer it may not be worth the small price you paid.
Personally, I stick with pny or sandisk.
Sent from my DInc2
Click to expand...
Click to collapse
yea you are right the card is not for a decent manufacturer,but I e-mail the guy and he gave my money back and he told me that i can keep the card.there are not pny 32g class 10,I can find 16g but not 32g,thanks...

TheAtheistReverend said:
Try formatting the card.
Click to expand...
Click to collapse
I did that but nothing change,I tried the card in a unrooted droid inc1 and there ate not differences.but what im going to do is save all videos and photos in my laptop and start from cero,taking pictures,videos,ect,ect,ect,and i will let you know guys........

FC127 said:
What is the brand on the card? It may look good, at 32gb class 10, but if its not from a decent manufacturer it may not be worth the small price you paid.
Personally, I stick with pny or sandisk.
Sent from my DInc2
Click to expand...
Click to collapse
I bought another microsd 32g class 10, But this one is PNY and work great i dont have any issue transfering my files.I boughted in Newegg.

Thanks for the FYI on Pny.
I know they are a cheaper brand(price-wise) so I tended to avoid them for more name-brands.

is it a simple COPY > PASTE affair to upgrade to a new card?
i read in the past that other phones used the sd card for swap and such, which needed different procedures to upgrade but the Inc2 doesn't have any of that dependency
i picked up a 32GB Class 4 Sandisk card which should be arriving tomorrow. Hope the upgrade goes as smooth as yours
ps. you should do some benchmarks of your pny class 10 vs the OEM card. as i understand it, the sd controller in our phones aren't rated for class 10 speeds, which is why i didn't bite on the faster (more expensive) class 10 card. it would be interesting to see a comparison though.
you can use something like AnTuTu Benchmark or SD Tools. both available from the market.

junknstuff said:
ps. you should do some benchmarks of your pny class 10 vs the OEM card. as i understand it, the sd controller in our phones aren't rated for class 10 speeds, which is why i didn't bite on the faster (more expensive) class 10 card. it would be interesting to see a comparison though.
you can use something like AnTuTu Benchmark or SD Tools. both available from the market.
Click to expand...
Click to collapse
This. a class 10 is kinda pointless for a phone. i remember reading somewhere on here about how any card above a class 6 will slow the phone down.
Also that off brand sd card was probably not a 32gb nor a class 10.
I bought something similar off ebay a while back and it ended up being a card that was labeled 32gb class 10 but the benchmark stated it was a 200mb class 2 or something like that. They take these already labeled 32gb class 10 cards which failed the test off the line and resell them as such although they are not.
glad you got your money back

i used AnTuTu Benchmark with the OEM 16gb class 4 card.
read: 4.4 MB/s
write: 16.6 MB/s
the Sandisk 32GB Class 4 card I picked up, according to the reviews, have above-standard write speeds for a Class 4 (something like 5-6MB/s). i'll post up scores when it gets in but i would suggest this one just for it's brand name and consistent reviews
http://www.newegg.com/Product/Product.aspx?Item=N82E16820171487

Buy that card from Taobao?

hey guys. i have been trying to migrate over to the 32GB sandisk card without luck. the file transfers over just fine but my phone can't identify where the apps are (the card is recognized in the phone, including the full capacity).
i'm trying to resolve this before doing the benchmark. any help is appreciated!
Ps: i just copy>pasted from the old card to the new card. nothing fancy and no errors. and yes i do use App2SD

junknstuff said:
hey guys. i have been trying to migrate over to the 32GB sandisk card without luck. the file transfers over just fine but my phone can't identify where the apps are (the card is recognized in the phone, including the full capacity).
i'm trying to resolve this before doing the benchmark. any help is appreciated!
Ps: i just copy>pasted from the old card to the new card. nothing fancy and no errors. and yes i do use App2SD
Click to expand...
Click to collapse
Did you unmount the old on from your phone, stick the new one in and format the new one first?
Sent from my Mikrunny'd Superphone using Forum Runner

junknstuff said:
hey guys. i have been trying to migrate over to the 32GB sandisk card without luck. the file transfers over just fine but my phone can't identify where the apps are (the card is recognized in the phone, including the full capacity).
i'm trying to resolve this before doing the benchmark. any help is appreciated!
Ps: i just copy>pasted from the old card to the new card. nothing fancy and no errors. and yes i do use App2SD
Click to expand...
Click to collapse
Did you try rebooting after you put the card in
Sent from my Incredible 2 using xda premium

buy a new card,hehe

I think,the problem is the sd card, i had problem before with the first 32g sd card but when i purchase a 32g pny sd card class 10..i could swipe everything whit no problems.