Problem to create a usb key bootable

Hi,

I want to install SLES11 with my usb key but I couldn’t to make it bootable. Because my server are only a cdrom drive, not dvd…
I read the following document :
SuSE install from USB drive - openSUSE
but it doesn’t run! So I can mount/umount the usb and linux could see him:

mount /dev/sda /mnt/usb

but the fsck.vfat doesn’t run :

fsck.vfat /dev/sda1
open /dev/sda1:No such file or directory

What’s the problem??
Thanks in advance,
nm

These are the openSUSE forums, you’d better post in Novell’s SLED/SLES forums.

Ok, thanks!