cant access networked usb-stick

I cant get at my usb ports on my desktop, but can on my laptop ( next to it
& networked)
1) i can mount the pendrive from the laptop
from laptop - /etc/fstab
/dev/sda /mnt/pendrive auto moauto,user,exec,umask=000 0 0
I can read and write to the pendrive as laptop user

from the desktop:
bash-2.05b# mount -t nfs 192.168.1.9:/mnt/pendrive /mnt/pendrive
bash-2.05b# ls /mnt/pendrive
Blank10.xls Differential Equations.sxw Music Coursework.sxw
change to user and I can still see the files:

bash-2.05b$ cp /mnt/pendrive/Music\ Coursework.sxw /tmp
cp: cannot stat `/mnt/pendrive/Music Coursework.sxw': Input/output error

bash-2.05b$ ls -la /mnt/pendrive
ls: /mnt/pendrive/Music Coursework.sxw: Input/output error
ls: /mnt/pendrive/Differential Equations.sxw: Input/output error
ls: /mnt/pendrive/Blank10.xls: Input/output error
ls: /mnt/pendrive/.directory: Input/output error

and in Konqueror (as user) on desktop machine mnt/pendrive appears empty

this is linux - there must be a solution :-))