View Full Version : [ubuntu] USB drive slow with ext3

November 26th, 2008, 01:30 PM

I just bought a new USB hard drive (USB 2.0, 7200rpm). Out of the box the drive was formatted FAT32. I did a speed test with hdparm:

sudo hdparm -t /dev/sdb1

Timing buffered disk reads: 210 MB in 3.05 seconds = 68.75 MB/sec

Looks ok I thought. Then I formatted the drive with ext3 because I thought that's better when I use it with Linux only. After the format I ran hdparm again:

Timing buffered disk reads: 102 MB in 3.01 seconds = 33.89 MB/sec

WOW it's half the speed it had with FAT32. Why is it so much slower with ext3?

Thanks for any help.

Best regards,

Merijn Schering

November 26th, 2008, 03:10 PM
it might be because the journaling. Have you tried it with ext2 instead? or maybe xfs(still has a journal but better performance IMHO)?

November 27th, 2008, 09:05 AM
I will try ext2. But I just can't believe ext3 is so slow...

November 28th, 2008, 01:09 PM
I think my first test results were false. Because when I reformat the drive with fat32 it also shows 33MB/s now. All filesystems show equal results now...