Badger said:
Did you boot originally with the Zip drive having a disk in it?
If you did, then the Zip drive is controlling the action of your computer.
The only recourse is to remove the disk and shutdown, then reboot without
the disk in the Zip drive.
Not always true, but it may be in the OPs case. I have tested the theory
presented by you with my USB Zip 100 drive and with or without a disk in the
drive upon boot-up I can access, eject and insert another disk in the drive
without issues of having the computer locking the drive. In the OP's case I
am wondering if the program creates a "playlist" that causes the drive to
lock and doesn't release it on program closing.
There are some programs that will lock the drive until reboot but I don't
have one on this Vista machine but I do on one of my XP machines. If I even
run the program (and it doesn't access the ZIP drive during it's time
running to get or write data to it) it locks the drive. This is a piece of
vertical software that even locks the CD/DVD drives on the computer.
Apparently one of the program's routines will lock all removable drives on
the machine. Since the program doesn't release the drives during exit, a
reboot is required. Granted a poor piece of program writing but if the
program is necessary for business operations...