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Big difference in writing speed of 32GB Class 10 sd card between FAT32 and NTFS

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Thanks Meter: 2
By semilung, Junior Member on 23rd February 2012, 09:12 PM
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I got a Samsung 32 GB Class 10 microsd card today and formatted the it into NTFS in Windows 7, and copied a big file, the speed met the nominal value about 13 MB/s. But I found out later that android does not recognize NTFS format. Therefore I reformatted the card into FAT32 in Galaxy S2. But when I copied the same file into the card under Windows 7, the writing speed decreases to about 5 MB/s. Later I used the app called "SD Card Speed Tester" to test the speed, it told me the card is a Class 6 card!!!

Is there anyone having the same problem? The only solution I can come up with is to format the sd card into ext2 and try again. Can anyone tell me how to do it with the phone, is there an app for that?

Thank you in advance!
23rd February 2012, 09:43 PM |#2  
beston94's Avatar
Senior Member
Flag Stockholm
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I'm sorry to be the one telling you this but you might gotten a fake one...Where did you buy your sd card?
23rd February 2012, 09:55 PM |#3  
OP Junior Member
Thanks Meter: 2
I bought it from a German company. Nevertheless, I just test the card (still with FAT32) with the original SD adapter under Windows 7, the writing speed is about 10MB/s, which is more close to the nominal value. So I think it is the problem between GS2 and the card.

Any idea to format the card with ex2 by GS2?

Sent from my GT-I9100 using XDA App
23rd February 2012, 10:42 PM |#4  
xethor's Avatar
Senior Member
Flag Near London Hometown: Hyderabad Phone: Galaxy S II
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You should see better performance with NTFS, that is normal. Still, your speeds are unusually low.
23rd February 2012, 11:24 PM |#5  
OP Junior Member
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Originally Posted by xethor

You should see better performance with NTFS, that is normal. Still, your speeds are unusually low.

Finally, I test the card with adapter under Windows 7 on my laptop using h2testw for NTFS and FAT32 format, both of them have the same performance, about 10 MB/s for writing. And I also inserted the card with FAT32 format in milestone, the writing speed is still about 5 MB/s, I did not test with NTFS format.

The card costs me 30 euro, and it functions normally with adapter, so I don't bother to return it. However, I am warning you guys, do not buy SAMSUNG 32 GB Class10 sd card, it can only achieve around 5 MB/s with FAT32 format.
24th February 2012, 09:38 AM |#6  
DuperMan's Avatar
Senior Member
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If you can fill the card it's not a fake, the only problem here is your expectations from the i9100's sd card reader.
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