Hello and thanks for reading!

I've searched Windriver's forums and Microsoft's KB to no avail. I have 3 laptops (HP Omnibook 500, HP Omnibook 510 & IBM Thinkpad T30) running XP SP1 with latest patches & updated BIOS (laptop & expansion base). All 3 are "losing" their optical drives [CD (500) & 2 DVDs (510 & T30)]. When lost, the is absolutely no evidence in XP that the drive exists. The only repeatable scenario I've found is:

laptop docked
optical drive available
shutdown
undock
boot (optical available in T30, not physically present in 500/510)
shutdown
dock
boot
optical drive unavailable (all 3 laptops)

I've deleted both docked and undocked hardware profiles. Moving the floppy to the optical drive bay; floppy works.

Thanks for any insight!
SAM