MacPro is "seeing" phantom drives.

Question

he others are MacPros
We have been having trouble with broken links in illustrator, and found that the MacPro is "seeing" phantom drives. This is what the computer thinks is connected: external_Drive, external_Drive-1, external_Drive-2 external_Drive-3 external_Drive-4.
Drive 1 2 3 and 4 do not exist. Repairing permissions, running Applejack zaping the PRAM, switching accounts does not "unmount" these volumes.  they do not show up on the desk top, but when I run {cd /volumes LS } in terminal, it lists these phantom drives. This is happening on 6 out of 10 computers I have looked at.
this is what the log looks like:
Last login: Sun Jan 29 13:01:46 on ttys000
macintosh:~ kevinmaher$ cd /volumes
macintosh:volumes kevinmaher$ ls
100 GB video edit        Guardian of Forever, 2TB
Galileo                Guardian of Forever, 2TB 2
Macintosh HD
Galileo-1
Galileo-2
Galileo-3
Galileo-4
macintosh:volumes kevinmaher$
The info on this computer is:
Model Name:
iMac
  Model Identifier:
iMac7,1
  Processor Name:
Intel Core 2 Duo
  Processor Speed:
2.4 GHz
  Number Of Processors:
1
  Total Number Of Cores:
2
  L2 Cache:
4 MB
  Memory:
4 GB
  Bus Speed:
800 MHz
The others are all MacPros

Answer 1

Thanks, but Galileo is a 64 GB La Cie Flash drive (thumb drive) and Guardian of Forever, 2TB is a external Western Digital "My Book" running time Machine. When I eject Galileo, and relaunch terminal, it shows Galileo is still mounted, and when I reinsert Galileo my computer thinks there are two of them.
The issue is that if I place an eps file in illustrator, and pass it along to a co worker Illustrator "Thinks" the art is on a share point that does not exist, so all the links are broken.
That and I do not know how to purge these mounted volumes.
Oh, and thank you for your time, and getting back to me so quickly.