mounting zip disk

[Gerhard Magnus]

When I put a zip disk in the drive and use the "Mount" command I get
from the right mouse button applied to the zip disk icon on my KDE
desktop I get the error message: "mount /dev/hdd4 is not a valid block
device.  Please check that the disk is entered correctly."

What does this message mean and how can I get this zip disk mounted?  (I
don't care if the solution involves losing data on the zip disk.)

Thanks for the help!
Jerry