Copying to usb flash drive corrupts files

[Hans Petter Selasky]

On Monday 18 February 2008, Łukasz Sromek wrote:
> Hello.
>
> I asked this question on bsdforums.org, but I got no answer. I guess
> this list is a better place to post problems like this.
>
> When I copy mp3s from hard drive to usb stick they become corrupted.
>
> lukasz ~% mount /mnt/usb
> lukasz ~% cp file.mp3 /mnt/usb
> lukasz ~% diff file.mp3 /mnt/usb/file.mp3
> lukasz ~% umount /mnt/usb
> lukasz ~% mount /mnt/usb
> lukasz ~% diff file.mp3 /mnt/usb/file.mp3
> Files file.mp3 and /mnt/usb/file.mp3 differ
>
> If I set sync option in fstab:
>
> /dev/da0 /mnt/usb msdosfs rw,noauto,sync 0 0
>
> Then files are copied correctly, but very slowly, when buffer size is
> low. Midnight Commander uses 8k buffers, so I get about 20kB/s which
> is unacceptable.
>
> I'm using FreeBSD 7.0-RC2.
>
> Could you help me with this issue?

Maybe your memory stick is corrupted ?

What is the brand ?

--HPS