[Q] Slow/Poor micro-sd performance

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Hi, i bought some days ago an 8GB class 10 micro sd card, hoping it would speed up my phone (i was using app2sd+ with Kyrillo's ROM v7.1).

I didn't notice any diference compared to my old 4GB class 2 card, so i installed SD Tools app to test the speeds, and i realized all the cards i put in my phone get 4MB/s as the maximun write speed, i tried many different sd cards, class 2 and 10 and there's no difference. Then i tried the same cards in my girlfriend's Galaxy Ace and the speeds were much higher, 7~12 MB/s write speed.

I thought it was a rom problem, so i backed up with Titanium Backup and flashed a stock ROM (JPM), but the speeds remain the same (around 4 MB/s for writing), i also tried changing the buffer size from 128kb to 1024, 2048, 4096 with "SD Booster" and "SD Speed Increase" apps, but no good results...

Could my phone be faulty?
Is there any configuration i can try to make my sd card faster? any command line?
What are the speeds you reach with "SD Tools" and classes of your SD card?

Best Regards!

I'm not sure, but I think there's nothing you can do....
Mine is a 16GB class 6 and it's the same, whatever I try. Before had 8GB - was the same.
Whatever I wrote into the 'read ahead buffer'...
But maybe anyone else has an idea?

Try changing the buffer to 0 as sometimes that works.

Sent from my GT-I5800 using XDA App

Originally Posted by dilzo

Try changing the buffer to 0 as sometimes that works.

TNX for the tip, but unfortunately SAME RESULT...

i also get the same speeds..
i think thats a bug with sd tools.
By the way has any one tried data2sd/apps2sd v3? do you face lags?
also do you people have SD or SDHC

I belive that sdtools has a bug. Or is seriously faulty. I have 16GB class 2 sdcard and sdtools claims that my read and write speeds are equivavlent to class 6 card (values range from 6.x/6.x to 8.x/7.x, write/read, respectively (depending on read_ahead_kb values). And I know for a fact that this really cheap sdcard does not have such performance. You can try antutu benchmark, free app on market, which provides a bit more accurate results plus you can select what to benchmark. My card gets 3.0MB/s read and 2.0 MB/s write with default buffer values. Which is more accurate than sdtools. Especially because disks (any kind) usually have higher read rate than write rate (because it is easier to read data than to write it and 'cause we usually perform much more reading than writing, so it is optimized for read operations).

Originally Posted by mrvek

I belive that sdtools has a bug. Or is seriously faulty. I have 16GB class 2 sdcard and sdtools claims that my read and write speeds are equivavlent to class 6 card (values range from 6.x/6.x to 8.x/7.x, write/read, respectively (depending on read_ahead_kb values). And I know for a fact that this really cheap sdcard does not have such performance. You can try antutu benchmark, free app on market, which provides a bit more accurate results plus you can select what to benchmark. My card gets 3.0MB/s read and 2.0 MB/s write with default buffer values. Which is more accurate than sdtools. Especially because disks (any kind) usually have higher read rate than write rate (because it is easier to read data than to write it and 'cause we usually perform much more reading than writing, so it is optimized for read operations).

antutu give me 3.x and 4.x for write and read speed respectively!!
8gb class 10

That is odd. Do you have a card reader? Maybe you can bench from pc and see the results. I have only 2 sdcards, both class 2 and the results I get are to be expected from class 2 cards. There is also possibility that it is a low quality component. If you feel like it try to investigate, get cards info like serial, model and manufacturer and see what you'll discover. Nowadays people are selling everything claiming it to be a better than actually is. I remember reading tests regarding SD 's where they said that same card type from same manufacturer performed about 10 times worse just because one was.made in China and the other in taiwan, or something like that. I personally would do some research but it's up to you.

Originally Posted by mrvek

That is odd. Do you have a card reader? Maybe you can bench from pc and see the results. I have only 2 sdcards, both class 2 and the results I get are to be expected from class 2 cards. There is also possibility that it is a low quality component. If you feel like it try to investigate, get cards info like serial, model and manufacturer and see what you'll discover. Nowadays people are selling everything claiming it to be a better than actually is. I remember reading tests regarding SD 's where they said that same card type from same manufacturer performed about 10 times worse just because one was.made in China and the other in taiwan, or something like that. I personally would do some research but it's up to you.

well i did a bench mark from laptop's card reader.. it was way over 18 mbps.. cancelled the benchmark in the process as it was taking too long.. but half way read speed was definitely above 18mbps.. Also my sdhc's manufacturer is transcend. I hope this company wont betray us!!

well, in that case it might have to do with phone configuration/programming. Maybe devs could figure out why the phone does not utilize full potential of the sdcard. Perhaps low ram, (relatively) "slow" cpu, something...