[newbie] ejecting zip disk

[Fred Schroeder]

Hi!
I have just installed Mandrake 7.1, but haven't been able to figure out 
this zip drive thing.  I have an internal zip drive, and can mount the 
drive with the icon that 7.1 put on the desktop, but I don't know how to 
unmount the drive, to eject the disk.  If I try umount, it tells me that 
the dev is busy.  It is kind of a pain to reboot the system to change a 
zip disk!  Any idea what I am missing here?
TIA
Fred