Scuzzy (sic) Problems?

A customer of ours (damned annoying one at that) had a system brought to us (we had to travel 80km to get it) because of some strange intermittent problems (that he wanted fixed RIGHT NOW).

The problem, according to the customer, is that drive D and drive E will randomly switch. They have a 1GB SCSI Jaz drive, a 50X ASUS IDE CD-ROM, and a 10GB Western Digital IDE hard drive partitioned into two partitions (split 50/50). I have not been able to replicate this problem, and have begun thinking that the customer is smoking something funny.
It is under my impression that since the IDE hard drive initializes first (since it is bootable, and the Jaz drive isn't), it gets first crack at drive letters. The OS sees that there are two partitions, and assigns them drive C and D respectavely. THEN the OS notices that there is a removable SCSI device, and then assigns it drive E. The CD-ROM (which by default gets the last drive available, which in this case would be F) is being forced by the OS to go on Drive H (as F is assigned to the server). There is never a problem with the CD-ROM winding up on Drive E (as one may expect), or on Drive F. The apparent problem is that the SCSI device is randomly (in the middle of operation) switching to Drive D, and the secondary partition to the primary drive is magically switching to Drive E.
Am I missing something here? Has anyone else had this problem? If so, how does one circumvent it? If not, where can I get what the customer is smoking so I can replicate the problem.

------------------
***the Beast
- I only came for the platypus soup

Do you have a delay set in the bios for the SCSI drive to delay boot for a second or 2. The problem could be they are doing a cold boot and the drive is grabbing another drive letter becaused it hasn't initialized yet, when they do a warm boot it has already initialized so it gets another drive letter. Just a thought

Hmm...Thanks for pointing me in that direction. I think I may have found the problem. There is an option under the SCSI controller setup that is "Support for Removable Disk Under BIOS as Fixed Disk". It may be possible that it only does that when they have a disk in the drive...they reboot, the computer thinks it's a fixed disk, so the bootable partition gets Drive C, the next fixed (or so it thinks) disk gets drive D, then the first logical partition would then get drive E. This wouldn't happen if there isn't a disk in the drive (which they didn't give one to me, so there's no disk). It was set to "Boot Only", so I just set it to "Disabled", so if there is a removable drive, it won't assume that it's a fixed drive.
Make sense?

------------------
***the Beast
- I only came for the platypus soup