I had left an 8cm size CD in the BenQ 1620 when I powered off the computer yesterday. When I powered up, the 1620 was gone. Record Now gave me the first clue with a message about having no drives. There were no optical drives in "My Computer." And, there were no optical drives listed in Device Manager.
So, I removed the 8cm data cd (drivers for a Prolific USB to serial converter disc) and I put in a DVD on Ricoh 02, Ritek +R 12cm media. The drive did not reappear. With the disc still in the drive, I powered off the computer and powered it back on. The BenQ 1620 has now reappeared.
Weird, isn't it? Has anybody else had this happen?