samba - Sep 2004 - How can I mount a remote dos-partition?

Hi,

I have a small network with 3 linux-servers including samba 3.0.4. The
servers work very well. But now I want to share the hdds of my windows-and
dos-clients outside the local network. So I have to mount the remote
partitions on the different clients. On Win95/Win98/WinNT/Win2000 machines
it works perfectly. But there are some old dos-clients (ms dos 5.0). After
mounting a harddisk of one of these computers I get I/O errors, when I
make ls at the mountpoint. For example:

client: bush with hdd C   server: oil

mount -t smbfs -o username=..,passwd=.. //bush/C /export/bush/C

ok, it seems to be mounted, but the ls command returns with I/O errors.
What is going wrong?

cu
peter