Comment 6 for bug 334914

I've tried using Jaunty Alpha 4 and the bug is still there, as far as I can tell it only happens with automounting and only when writing, not when reading, I've performed some non-scientific experiments to help find the problem and its characteristics, you can find the results below and the log files requested attached.

Copying a 147 MB file from the PC(NTFS partition) to a 4GB USB drive(FAT32 partition):

Windows, copied using the GUI, stopwatch timing: 15s
Windows, copied using the cmdline(via copy), automatic timing(via wtime.exe): 13.8s

Jaunty Alpha 4, mounted automatically, copied using nautilus, stopwatch timing: 31s
Jaunty Alpha 4, mounted automatically, copied using terminal(cp), automatic timing(via time): 25.8s
Jaunty Alpha 4, mounted automatically, copied using terminal(dd), automatic timing(via dd): 26.1s, reported speed at end (5.9 MB/s)

Jaunty Alpha 4, mounted manually, copied using nautilus, stopwatch timing: 15s
Jaunty Alpha 4, mounted manually, copied using terminal(cp), automatic timing(via time): 16s
Jaunty Alpha 4, mounted manually, copied using terminal(dd), automatic timing(via dd): 16.1s, reported speed at end (9.5 MB/s)

Copying a 147 MB file from a USB drive(FAT32 partition) to the PC(NTFS partition):

Windows, copied using the GUI, stopwatch timing: 6.6s
Windows, copied using the cmdline(via copy), automatic timing(via wtime.exe): 6.8s

Jaunty Alpha 4, mounted automatically, copied using nautilus, stopwatch timing: 8s
Jaunty Alpha 4, mounted automatically, copied using terminal(cp), automatic timing(via time): 2.6s
Jaunty Alpha 4, mounted automatically, copied using terminal(dd), automatic timing(via dd): 18.8s, reported speed at end (8.2 MB/s)

Jaunty Alpha 4, mounted manually, copied using nautilus, stopwatch timing: 6.5s
Jaunty Alpha 4, mounted manually, copied using terminal(cp), automatic timing(via time): 2.5s
Jaunty Alpha 4, mounted manually, copied using terminal(dd), automatic timing(via dd): 17.9s, reported speed at end (8.6 MB/s)