Comment 64 for bug 197762

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Anton Veretenenko (anton.veretenenko) wrote : Re: file transfers on USB disk are very slow

Tested transfer rates from partition to partition on 2.6.27-7-generic kernel.
GUI copy starts at 10 Mb/s and then goes down to 6-7 Mb/s and stay.
dd from console is a bit faster, starts at 40+ Mb/s and slowly goes down to 13 Mb/s at the end with 14 Gb file.
The first Gb of data transfers pretty fast with dd.

$ dd if=test.file of=/media/disk/test.file bs=8M
1716+1 records in
1716+1 records out
14396870774 bytes (14 GB) copied, 1087.35 s, 13.2 MB/s
$ uname -r
2.6.27-7-generic

The same as on 2.6.27-11-generic kernel.