and how much of a difference does class actually matter? right now im cardless and need to pick one up... any info?
A SanDisk 32 GB Class 2
If the micro SD is not formatted and is bigger than 16 GB you have to format on a computer, android 2.1 limit. The Captivate will work with a 32 GB micro SD card, I have a net usable 29.29 GB on external SD on my phone. I am pretty sure Class 2 is about all that is available for 32 GB micro SD card (I could be wrong). Class rating have to do with how fast a card can read and write. If I was shooting HD video I would go to a class 6 probably (do not know if this is needed or not). Most comments I have read say a class 2 is okay for a cell phone.
i just put a 32gb in works fine except for playing 1.5gb movie files from it, i have to put those on the internal memory for some reason?
there is a 32gb class 6. Around $200. Im sure its awesome if you have a money tree. I got a 16gb class 4 for around $44. Playing some 700mb avi episodes of Dexter at 960x544 i downloaded off the web a few year back i have no lag in video or sound.
Hello XDA.
I have some questions about MicroSD cards in our phone. First of all, what is the maximum space it can handle? 32gb? And, what is the difference between class 4, 6, 10, etc. I know it has something to do with writing speed. But what is the maximum writing speed our phone can do? So i mean, the maximum class sdcard it can handle.
Thanks in advance.
Hi,
Yes 32gb is the max space this phone can handle.As far as i know classes are the write speed to the max of which data can be written on memory card.My friend uses class 10 mem card n i seen the data transfer of 9.8mbps on his phone,so surely it can write atleast at 9.8 mbps.i had used 32 gb card class 4 it was taking a bit long to load.right now i am using class 6 16gb sandisc its working great.
Hello,
I'm totally sad about my situation with my SD Card. I have a SanDisk Mobile Ultra microSD Class 6 16GB Card for my HTC Desire. I used it with MIUI Gingerbread and MIUI ICS and I'm installing Sandvolds ICS yet to look if I have trouble with MIUI only.
My problem is that I get always FC and Crashes. I have my old SD Card from PNY Class 10 with 8Gig and I it seems that I haven't any problems with this card. But there is a disadvantage with this SD Card: it is totally slow. I have to wait always some seconds until the app starts and this is really annoying if you want to look fastin the browser or something like that.
So, can you recommend any good SD Cards with 8-16GB memory? I don't know why this SanDisk Card makes so much trouble. I thought Sandisk is one of the best companies in memory cards?
Thanks
Greets,
Burak
I bought a Hama 16GB Class 10 micro SD. Haven't had any problems with that.
http://www.hama.de/00108088/hama-mi...-+-adapter-photo?bySearch=108088&searchMode=1
Regarding slow app starts. Are you using some sort of A2SD and have you moved APPDATA to SD?
--
I never had any problems with SanDisk, too.
Maybe Your SD-Card is broken?
Just try another Class10 SD-Card from SanDisk...
Try to format sd card with gparted (ubuntu) or partition magic (windows 7)
then
try to look for bad drive sectors (scan disk or every defrag tool).
Execute a microsd stress test for 1 hour at least.
If everything is ok, try to partitioning with Clockworkmod recovery.
What are you guys buying class 10 cards for? Those are designed for high definition video recording. You should be using class 4 or 6 with android phones, always. Any apps that need to read and write small chunks of data at high speed will get choked by class 10.
Sent from a galaxy far, far away
SJAirWolf said:
If everything is ok, try to partitioning with Clockworkmod recovery.
Click to expand...
Click to collapse
dont use CWM its pretty bad at partitioning. u recommended gparted so u shoulda just left it at that. 4ext recovery is the best recovery for partitioning sdcards and the best recovery
Sent from my HTC Desire
I'm using a Samsung 16GB Class 10 micro SD...i have no problem..realy fast!
CrystalDiskMark
Hello,
have you tried 'CrystalDiskMark' for benchmarking the MicroSD-Card? It runs under Windows and has a benchmark for 4k blocks (which are important for ext3/ext4 file systems).
Yesterday, my new SanDisk MicroSD card arrived and i tested all of my Cards. The results (all values in MB/s, the 4K entries are the interesting ones) are
SanDisk 16G Ultra Class 10 Micro SDHC (my new card)
Read: 18.76
Write: 11.92
Read 4K: 3.2
Write 4K: 1.54
SanDisk 4G Class 4 Micro SD (this card was originally delivered with my HTC Desire)
Read: 10.59
Write: 3.05
Read 4K: 0.9
Write 4K: 0.47
Tanscend 16G Class 4 Micro SDHC
Read: 18.65
Write: 4.85
Read 4K: 2.64
Write 4K: 1.26
Tanscend 16G Class 10 Micro SDHC (my actual used card)
Read: 16.47
Write: 16.07
Read 4K: 3.4
Write 4K: 0.027
As you can see on the last card, writing can be very slow on small blocks. I think, the internal block size on the most bigger class 10 cards is not optimized for small, but for big blocks. These behaviour is also documented here: http://forum.xda-developers.com/showpost.php?p=29365127&postcount=6827
Also, the partitions must be aligned to 4k. I did this by using the Linux fdisk for partitioning directly (sorry, all in german)
# fdisk /dev/sdf
Befehl (m für Hilfe): p
Disk /dev/sdf: 15.9 GB, 15931539456 bytes
64 Köpfe, 32 Sektoren/Spur, 15193 Zylinder, zusammen 31116288 Sektoren
Einheiten = Sektoren von 1 × 512 = 512 Bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Gerät boot. Anfang Ende Blöcke Id System
/dev/sdf1 2048 28494847 14246400 c W95 FAT32 (LBA)
/dev/sdf2 28494848 31116287 1310720 83 Linux
Click to expand...
Click to collapse
As you can see, the sector size is 512 Byte, so for a 4K alignment, the sector number must be divisible by 8.
Simon
I'm using sandisk 16GB class 6 and still okay for desire
Currently i'm using a "16 GB Poppstar Micro SDHC Class6" and it's working fine as a sd-ext in ext3. Cheap and good value for the money.
Samsung Class10 Micro Sd, partitioning with 4ext recovery. Everithing went fine and fast.
Transcend 16gb class 6 do the best job for me but I usually format the card with 4ext before flash new rom
Hello,
I'm sorry that I answer only now. I forgot this problem with my sd card totally . Thanks for the recommendation, I will look for a Samsung SD Card or another SanDisk SD Card Class 4. Maybe it has some problem with this Ultra MicroSDHC cards....
I use 4ext recovery touch and did the partition with it. I checked the alignment too. I tried to partition the sd card with GParted by myself, but it failed as I wanted to install the ROM. I don't know what matter was.
Thanks.
vBurak said:
Hello,
I'm sorry that I answer only now. I forgot this problem with my sd card totally . Thanks for the recommendation, I will look for a Samsung SD Card or another SanDisk SD Card Class 4. Maybe it has some problem with this Ultra MicroSDHC cards....
I use 4ext recovery touch and did the partition with it. I checked the alignment too. I tried to partition the sd card with GParted by myself, but it failed as I wanted to install the ROM. I don't know what matter was.
Thanks.
Click to expand...
Click to collapse
You should look for a Class 10 (x150, up to 20MB/s read and up to 15MB/s write), mine emtec 8GB has been bought for $15 with adapter and 5 years manufacturers warranty. Working great in Desire
I have some Kingston 16 Gb class 4 micro SDHC and it's ok even if I use data2sd, int2ext and such.
nonline said:
You should look for a Class 10 (x150, up to 20MB/s read and up to 15MB/s write), mine emtec 8GB has been bought for $15 with adapter and 5 years manufacturers warranty. Working great in Desire
Click to expand...
Click to collapse
No, class 10 is designed for recording high definition video. Class 4 and 6 are the most compatible with the Android operating system, and the apps used by it.
Try reading the thread, or actually doing some research before you attempt to make recommendations.
Sent from a galaxy far, far away
I have now Samsung Class 10 16GB Micro SD Card and it works well. I use some modded a2sd script (lx2sd or something i don't know) and everything is on the sd card except dalvik cache. If I open some apps I have to wait 2-3 seconds but it's no big deal.
I didn't find any class 6 sd card from samsung, so I took the class 10. random 4 write was really low like 0,03 mb/s but now i have it and I don't care anymore .
captain67 said:
No, class 10 is designed for recording high definition video. Class 4 and 6 are the most compatible with the Android operating system, and the apps used by it.
Try reading the thread, or actually doing some research before you attempt to make recommendations.
Sent from a galaxy far, far away
Click to expand...
Click to collapse
That is not entirely true. That random 4k read/write speed is just a benchmark. Who told you that the .dex files are scattered in random blocks on the sd-ext? 99% of the time they are not. That's where the sequential speed kicks in and that's why anyone who uses a class10 over a class 4 sees a huge improvement in responsiveness.
Plus, no lag on 720p recording with sense roms. That's just a bonus.
I'm using a Transcend 16 GB class 10 card. The card is working very good as sd-ext with ext4 partition
It seems that low class sd card such as 1 or 2 can not use cronmod script.
i tried billion times and always fail with my 8 gb card that is 2nd class.
and with my 2gb sd card that is big class sucess from first time.
So you is it true that low class sd card can not increase the internal memory?
-Anyone has increased his internal memory with low class sd card?
Thanks about your answers
Hi,
I have my SD card (class 6) merged with my internal storage. Every app I move to the SD card lags like hell! They work perfect when on the internal storage. My storage is starting to fill though as it's only an 8GB device. Any ideas? I've been thinking that if I get a class 3 uhc SD card (they reckon they're up to 60 MB/s) but I'm not sure is that the problem?
Thanks for your advice.
Class 10 should be bare minimum. I am pretty sure the class 6 card is the cause. Uhs 3 is recommended.
Broadcasted from Zeta Reticuli
I would concur with @Gravemind2015 your card is too slow... Although I think a minimum UHS1 card is required to make it usable due to the higher write speed than a Class 10, but I do agree a UHS3 is recommended.
A Class 6 card is just too slow for use as adopted storage, I would convert it back to portable until you can get a new card or it will constantly lag on you.
Thank you for your help
I've bought a UHS Class 3 card, installed it and it's solved the problem.
acejavelin said:
I would concur with @Gravemind2015 your card is too slow... Although I think a minimum UHS1 card is required to make it usable due to the higher write speed than a Class 10, but I do agree a UHS3 is recommended.
A Class 6 card is just too slow for use as adopted storage, I would convert it back to portable until you can get a new card or it will constantly lag on you.
Click to expand...
Click to collapse
sir can i ask? i got same problem here, now i used sandisk micro SDHC UHS-I Class 10 16GB speed up to 48mb/s. but i still got lag, that laggy was from my phone or my sd card? if it cause by sd card, and than i'll buy UHS-3 class 10 speed up to 90mb/s. it will solved my laggy? i used Moto g4 plus 2/16 run with MM 6.0.1
jincuriki said:
sir can i ask? i got same problem here, now i used sandisk micro SDHC UHS-I Class 10 16GB speed up to 48mb/s. but i still got lag, that laggy was from my phone or my sd card? if it cause by sd card, and than i'll buy UHS-3 class 10 speed up to 90mb/s. it will solved my laggy? i used Moto g4 plus 2/16 run with MM 6.0.1
Click to expand...
Click to collapse
The card reader in the 3rd and 4th generation G devices is UHS-1, it's write speed is limited in real world use is limited to about 45mbps, or about 1/2 to 1/3 of the embedded storage chip... You will always have some lag by comparison. Will a U3 card be better? I can't answer that definitively since it would vary based on your specific usage.