Database Users

Why is a Class 6 SD (and a2sd) better?

I have a PNY Class 6 8GB MicroSD for my phone. I was wondering what are the benefits of a2sd, and what are the benefits of a class 6 SD rather than a lower number? I don't currently use a2sd, and wondering if i should.

lower number is slower. iirc, the Hero supports speeds up to class 6, which is faster then the phones ROM
Sent from my HERO200 using the XDA mobile application powered by Tapatalk

abcdfv said:
lower number is slower. iirc, the Hero supports speeds up to class 6, which is faster then the phones ROM
Sent from my HERO200 using the XDA mobile application powered by Tapatalk
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Click to collapse
Ok, that makes sense, but why should I use a2sd? How is it better than storing them on internal memory?

if its a class 6 it will load faster.
Sent from my HERO200 using the XDA mobile application powered by Tapatalk

Ability to have more apps installed, as well as not having to wipe all the applications when you flash a new ROM (although some require you to wipe the ext partition, the ROM chef will tell you if you need to wipe the ext parition (where your apps are stored).
I didn't think I would ever need A2SD until I got to my limit.
I have not noticed a drop in performance opening apps with A2SD on my class 6 card, if there is, its milliseconds.

HeroMeng said:
Ok, that makes sense, but why should I use a2sd? How is it better than storing them on internal memory?
Click to expand...
Click to collapse
A2SD moves all of your installed apps to the SD card. If you have a class 6 card, which have a faster read and write speed than the internal memory in the phone, it makes everything run a lot faster since it doesn't have to run everything from the phone.

sorry to get off topic a bit, but ive been looking for a good class 6 card. the only brand i have seen is a-data i believe for about 20 dollars. im not really looking for something that has a large capacity. in your opinion, which one is better as far as brand? and how much did you pay for your card?

One thing to remember though is that class 6 just means it is certified/guaranteed to transfer at 6MB/sec or faster. A class 2 card can still be as fast or faster than a class 6 and there are some out there that do just this.

jlem26 said:
One thing to remember though is that class 6 just means it is certified/guaranteed to transfer at 6MB/sec or faster. A class 2 card can still be as fast or faster than a class 6 and there are some out there that do just this.
Click to expand...
Click to collapse
This is what I stopped in to say.
+1

kashb91 said:
sorry to get off topic a bit, but ive been looking for a good class 6 card. the only brand i have seen is a-data i believe for about 20 dollars. im not really looking for something that has a large capacity. in your opinion, which one is better as far as brand? and how much did you pay for your card?
Click to expand...
Click to collapse
I wouldn't... every A-Data sdcard I've ever bought has developed bad sectors almost immediately.
Sandisk is the standard, but a class 6 SanDisk is hard to find. The last few I bought were Transcend.

How do you tell what class your card is?

danieledwards1 said:
How do you tell what class your card is?
Click to expand...
Click to collapse
It's on the card itself. It's the letter C with a number inside it. That number is the class number.

posguy99 said:
I wouldn't... every A-Data sdcard I've ever bought has developed bad sectors almost immediately.
Sandisk is the standard, but a class 6 SanDisk is hard to find. The last few I bought were Transcend.
Click to expand...
Click to collapse
thats what ive always been looking for, but as you said its hard to find. if you dont mind me asking how much did you pay for your card and what size is it? also, thanks for the heads up on the a-data card.

I read a review not long ago about sandisk class 2 cards. the tests they ran on them showed they were the equivalent to 10 mb/s. of course you would have to get the right batch number. does anyone know a site that tracks this kind of info?
Sent from my HERO200 using Tapatalk

I have a class 6 Transcend and use app2sd. Just wondering how much memory is it supposed to be freeing up?

gizmosears said:
I have a class 6 Transcend and use app2sd. Just wondering how much memory is it supposed to be freeing up?
Click to expand...
Click to collapse
Depends on how you use a2sd.
If you move dalvik-cache to it as well as your apps it'll be a lot.
But the total amount depends on the number and size of the apps you have installed. I'm sitting with 126/160mb free on Internal Storage.

jlem26 said:
One thing to remember though is that class 6 just means it is certified/guaranteed to transfer at 6MB/sec or faster. A class 2 card can still be as fast or faster than a class 6 and there are some out there that do just this.
Click to expand...
Click to collapse
bobsbobbers said:
This is what I stopped in to say.
+1
Click to expand...
Click to collapse
+2 I have a Class 2 card and I get around ~7+MB/sec, I'm tempted to bump it up to run A2SD more aggressively so that my phone's faster.

i was thinking about buying a class 4 16 gb Sd card.. will this help at all i am not running app2sd..so will the sd card make any difference??
Will it make my screen run smoother and fast on Damage Control 2.8??

xxxk15 said:
i was thinking about buying a class 4 16 gb Sd card.. will this help at all i am not running app2sd..so will the sd card make any difference??
Click to expand...
Click to collapse
If you're not using a2sd it probably won't make much difference either way. If you're thinking of running a2sd later spend the extra 10.00 and get the class 6. regardless of the people talking about their high speed class 2 cards, you'd have to be fairly lucky to get those speeds (as someone else noted, depends on the batch of cards) with class 2, or 4.

an also if i run app2sd if i pull out my memory card at anytime will it mess up my phone??
and i have the 1st class right now so upgrading will make no difference when downloading apps to my phone or anything like that??

[Q] Fastest SD for Android on HD2

Hi guys i have been using
FroyoStone Sense - V2 for couple of days now and with basic winmo install, so far I love it.
Although it seems to slow down when more stuff is opened also when using Astro for file explorer.
Since this android build is all running from the SD card are there better cards like faster ones? I'm using the original 16g that came with my T-mobile phone. Is that the fastest i can have for that phone?

what's your sd card class ?

kawazaki said:
what's your sd card class ?
Click to expand...
Click to collapse
Class 2 i think

im usung a 4gb class 6 and its screaming compared to my friends using the included (class 2) 16gb cards.
so yes the speed of the sd card helps, they go all the way up to class 10

strickzilla said:
im usung a 4gb class 6 and its screaming compared to my friends using the included (class 2) 16gb cards.
so yes the speed of the sd card helps, they go all the way up to class 10
Click to expand...
Click to collapse
ok thx looks like im getting new sd

Class 6 seems to be the most popular. I went with this one.

wait till the nand rom comes..it will be there soon
DN41

im not sure i want an incomplete rom in the nand.

I'm using a 16gb Kingston C10, and yes it's really fast, compared to my old
16gb sandisk C2.

Ok but now I need to transfer my android and all the stuff to the new sd
should I just copy over all the folders and thats all?
I want to keep all my settings cotacts, apps and more!

Best SD Card?

I recently bought a 16GB Patriot MicroSD card, class 10. I find that after 24 hours of use, things start to fall apart (I've tried several different SD builds). I also have Sandisk 16GB Class 2 card that runs my daily Android software; never had a problem with it in 2 months. I follow the same procedure when attaching the card via a reader and removing it from my computer. I also use the same procedure when attaching the phone to my PC. I have concluded that the new Class 10 card is failing. My questions are:
1. Is anyone using a Patriot 16GB Class 10 card with success?
2. Can you give me an opinion of the best 16GB card when using Android on the HD2?
3. Could the Patriot card be too fast for the HD2?
4. Is there a maximum class rating I should not go over?
Thanks in advance.
-Bob-

The best SD Card for me is ''Kingston 16gb Class4'', never have had a problem.

pao17 said:
The best SD Card for me is ''Kingston 16gb Class4'', never have had a problem.
Click to expand...
Click to collapse
Same is true with my very old Adata 16gb Class 2. But, I was hoping to get a bit more speed.

I think class 10 is too fast (and expensive XD ) for the HD2,
I got Kingston 16GB Class 4 and it works perfectly.

Hey all. I've got a 16gb Patriot class 10 installed, been using 1week now with no issues, Cotulla's Nand stock desire rom. Seem a little faster than the stock provided card, not sure if was worth the $ for the slight boost though.
Sent from my Nand~Droided HTC HD2
3/19/2011 - my 16gb patriot still no issues. Mine has been formatted multiple times and been re-partitioned with ext3 and even split for dual boot wp7 and hyperdroid gbx v7 and now v9 and have noted no sdcard related problems. Have downloaded and deleted multiple apps, and currently have 6gb of full DVDs on it. Have noted with all SD cards, you gotta pay attention when you're instructed to mount/dismount card via phone or when in mass storage mode connected to PC via USB, or when in PC using card reader or data can get corrupted. Hope this helps.

blhd2 said:
Hey all. I've got a 16gb Patriot class 10 installed, been using 1week now with no issues, Cotulla's Nand stock desire rom. Seem a little faster than the stock provided card, not sure if was worth the $ for the slight boost though.
Sent from my Nand~Droided HTC HD2
Click to expand...
Click to collapse
Hmmm, I absolutely can't seem to keep it from crashing. Right now I'm experimenting with another class 2 card to see if I can manage to destroy the installation again. Glad it's working for you. Might the difference be that I'm running an SD version from the card using the current stock HTC ROM?
-Bob-

32GB SD which one best for defy?

Hey Folks!
Anyone is useing 32GB SD here with defy? and have experience too?
I wanna replace my current 16GB SD beacuse i need more space, only the gameloft folder more than 10GB...
So what the correct brand that works flawless with defy? So i need experience about from you.
Maybe put sd tools bench here, thx.

Icidu MicroSDHC 32GB, Class4 working fine here.

I have Kingston 32GB class 4...Works like a charm for over a month now...

Thx pals!
i forgot, pls write what OS ver., i use CM7 RC0.

somebody with class 10?

sirdamnedone said:
Hey Folks!
Anyone is useing 32GB SD here with defy? and have experience too?
I wanna replace my current 16GB SD beacuse i need more space, only the gameloft folder more than 10GB...
So what the correct brand that works flawless with defy? So i need experience about from you.
Maybe put sd tools bench here, thx.
Click to expand...
Click to collapse
same thread here..
forum.xda-developers.com/showthread.php?p=14825893

Hey guys, i have a question.
Defy with sd card 32GB don't have a slow running in the apps and system? I think when search data of app have a scann all SD and need some time, so have a slow run.
PS: Sorry for my Inglish! :$

SanDisk 32GB class 2
Works perfect.
Right now I am running Android 2.3.4

NoName 32GB class 2, 20€...works...

sirdamnedone said:
somebody with class 10?
Click to expand...
Click to collapse
I use Kinstom 32GB class10 early. But when I take photo, some photo maybe have error.
After that I check for internet about it. Someone said that maybe Kinstom's problem. It's not stable.
Now I use the Sandisk 32GB class4.
Maybe defy not support class10.
or that's Kinstom's problem. I don't know.

bkk99213 said:
I use Kinstom 32GB class10 early. But when I take photo, some photo maybe have error.
After that I check for internet about it. Someone said that maybe Kinstom's problem. It's not stable.
Now I use the Sandisk 32GB class4.
Maybe defy not support class10.
or that's Kinstom's problem. I don't know.
Click to expand...
Click to collapse
I bought a Team 16Gb Class 10 micro SD and it freeze my Defy, but I read that all Smartphone have trouble with class 10 cards (maemo and WP7 too).
It's something related to voltage (if you use setsvel to undervolt) and with partition (you need format the card with 32k or 64k)
I think Class 4-6 will be enough, until the Android Kernel will support class10.

diamond_lover said:
I bought a Team 16Gb Class 10 micro SD and it freeze my Defy, but I read that all Smartphone have trouble with class 10 cards (maemo and WP7 too).
It's something related to voltage (if you use setsvel to undervolt) and with partition (you need format the card with 32k or 64k)
I think Class 4-6 will be enough, until the Android Kernel will support class10.
Click to expand...
Click to collapse
I don't know my card's partition. Can I find it in my phone?

bkk99213 said:
I don't know my card's partition. Can I find it in my phone?
Click to expand...
Click to collapse
Did you mean SD Class?
Just look at the card, it has either a 2 or a 4 or a 6 in a circle stamped on it. Thats the class. The class = the number of MB/S it can transfer.

Ricardo_Is said:
Did you mean SD Class?
Just look at the card, it has either a 2 or a 4 or a 6 in a circle stamped on it. Thats the class. The class = the number of MB/S it can transfer.
Click to expand...
Click to collapse
No. Class=speed only. He said the partition have 32K 64K.....I think that is not Class. Because the class can't change when you format the sd card.

bkk99213 said:
I use Kinstom 32GB class10 early. But when I take photo, some photo maybe have error.
After that I check for internet about it. Someone said that maybe Kinstom's problem. It's not stable.
Now I use the Sandisk 32GB class4.
Maybe defy not support class10.
or that's Kinstom's problem. I don't know.
Click to expand...
Click to collapse
thx 4 the info 4 all!
Now, my mainly target is sandisk 32GB class 4

dont buy class 10 for deft,
always error
Sent from my MB525 using XDA Premium App

Using a class 4 32 GB Kingston since a few days, working nicely. Got 5.5 MB/s write, 12 MB/s read. Thanks for the info, I was going to buy a more expensive (and I though, more future proof and safer) class 10 one, before I read about the compatibility problems with class 10 here.

using class 6 non brand. Works perfectly with 2.3.4 CM7

bkk99213 said:
I don't know my card's partition. Can I find it in my phone?
Click to expand...
Click to collapse
If you want to find out what partition your card is just plug it into your computer then mount as SD storage. Right click on the card from "computer" and select format. The default settings your card is set at will be shown. You can change it to other sizes, and formats (like FAT, NTFS, but FAT32 should be default and used for phones). I recently formatted my Samsung 8GB class 6 at 4069, and no issues so far. Don't worry it won't format unless you select to format, so you can do this just to check.

Hi there, because of this thread i bought a class 6 16GB Trancend SD card. Formatted it with 64kb clusters now have 11,2 Write and 21,9 Read speed (in SD tools).
Thx you all for the advice not to buy a class 10!
Running GB 2.3.4 nandroid.

Problems with 64GB SD card

Hi.
I recently bought myself a 64GB class 10 Sandisk card from Amazon which I was going to use with my Note 3. When I first put it in I formatted the card in the phone. And then I took a few pictures and videos and all seemed to work fine.
The next day when I was taking some photos it suddenly switched over to the internal memory and I got the message that it was unable to save to SD card. I checked the gallery and the last picture i took was corrupted. So after this I tried taking the card out with the phone turned off, put it back in and started the phone. I was able to take some photos but when I was going to record a video it corrupted the file again.
After this I put the card in my PC and did a full format to exFAT and tried filling all ~59GB with pictures, videos and other files and from what I could see no files were corrupted.
Then I formatted it once again in my PC to exFAT and put it in the phone. After a few pictures it once again corrupted the files, even the camera app (default one) crashed at one point. Formatted the card in my phone again but same problem.
I then tried the card in my Gopro camera, first formatted it in the camera then recorded several videos in both 4K, 1440P, 1080P and took several pictures and everything was fine.
I'm not sure but the card seems to be working in other devices. Do you think the problem is the card or my phone? Before this I've used a 16GB class 4 Sandisk card with no problems at all.
Any tips on what I can do?
Thank you in advance!

Are you have a custom rom or just rooted as I think you need to flash sdfix
Sent from my SM-N9005 using xda app-developers app

sehooo said:
Are you have a custom rom or just rooted as I think you need to flash sdfix
Sent from my SM-N9005 using xda app-developers app
Click to expand...
Click to collapse
It's stock and not rooted.

Could be a bad card, try unmounting and mounting the card again and see if that fixes it.

RaptorMD said:
Could be a bad card, try unmounting and mounting the card again and see if that fixes it.
Click to expand...
Click to collapse
Yeah I've tried that a few times as well and it didn't help. But as I mentioned the card seems to work just fine it other devices. But in my note 3 files get corrupted.
Do you know of any program or any other way to test/confirm that it is the card that's bad?

crewol said:
Yeah I've tried that a few times as well and it didn't help. But as I mentioned the card seems to work just fine it other devices. But in my note 3 files get corrupted.
Do you know of any program or any other way to test/confirm that it is the card that's bad?
Click to expand...
Click to collapse
Actually I do. I have used the HP SD Card Format Tool to fix cards in the past and it has worked pretty well. I also found this thread here on XDA that references it as well.
http://download.cnet.com/HP-USB-Disk-Storage-Format-Tool/3000-2094_4-10974082.html
http://forum.xda-developers.com/showthread.php?t=1900259
Good luck.

crewol said:
...
I'm not sure but the card seems to be working in other devices. Do you think the problem is the card or my phone? Before this I've used a 16GB class 4 Sandisk card with no problems at all.
Any tips on what I can do?
Thank you in advance!
Click to expand...
Click to collapse
What write and read speeds were you getting in the PC? The Sandisk models are among the most faked models and that is by far the most frequent problem that I have seen. There have been also certain batches with problems, but Sandisk is always replacing those almost no questions asked if it is a genuine card.
I also have a 64GB Sandisk Ultra which was used about 1 year in my i9300 and now almost 4 months in the N9005 and so far I have never had any problems (but I am keeping an eye on the 128 GB models if those seriously go down in price).

RaptorMD said:
Actually I do. I have used the HP SD Card Format Tool to fix cards in the past and it has worked pretty well. I also found this thread here on XDA that references it as well.
http://download.cnet.com/HP-USB-Disk-Storage-Format-Tool/3000-2094_4-10974082.html
http://forum.xda-developers.com/showthread.php?t=1900259
Good luck.
Click to expand...
Click to collapse
Thanks I might try that later!
xclub_101 said:
What write and read speeds were you getting in the PC? The Sandisk models are among the most faked models and that is by far the most frequent problem that I have seen. There have been also certain batches with problems, but Sandisk is always replacing those almost no questions asked if it is a genuine card.
I also have a 64GB Sandisk Ultra which was used about 1 year in my i9300 and now almost 4 months in the N9005 and so far I have never had any problems (but I am keeping an eye on the 128 GB models if those seriously go down in price).
Click to expand...
Click to collapse
I just ran a test in the program H2testw 1.4 and got these results:
Warning: only 60872 of 60874 MByte tested.
Test finished without errors.
You can now delete the past files *.h2w or verify them again.
Writing speed: 8.49 MByte/s
Reading speed: 17.5 MByte/s
H2testw v1.4
So the reading speeds seems fine I guess, it also filled the card with files and verified it.
I would assume that if it was a fake it would have slower speeds and maybe only 2-4GB of space?
I am using the SD card adapter that came with the SD card, and then I put it in a USB SD card adapter in a USB 2.0 port.

Is anyone else having problems with 64GB SD cards? It's as if my Note 3 wasn't compatible with the card since it is working fine in other devices and isn't a bad card according to the test I did.

Sorry .deleted.

Sounds like a hardware fault on the Note 3... I've been using both a sandisk and a samsung 64gb class 10 card on both my note 3's with no problems from the start...
Never had a problem with file corruption....
sdhc and sdxc are 2 different formats - sounds like you could use a 32gb sd card fine but it has issues with the 64gb sd card.... 64gb sd card is the newer format sdxc....
Unfortunately here you hit a snag... Unless the samsung sites list 64gb as ok to use on the Note 3 then they may just say to to warranty repairs.... If 64gb is the listed size (generally "up to ") you should have no problem. It does sound like your card reader doesn't like sdxc... Unless you can get your hands on another 64gb sd card to find out you not be able to use your 64gb sd card...