Interesting! I had a similar problem with an external USB DVDRW drive after SP2 got installed. No drive Icon anymore. I tried installing the USB drive in a firewire card....it still doesn't exist. Now I'll be doing a specific driver update and if that doesn't work....XP fresh reinstall. I want answers too!
Noli Nothis Permittere Te Terere!!
EVGA 680i, Dual EVGA 8800GT'S (650/950), 4 gigs OCZ DDR2 1066, Intel Q9450 at 3.8 Ghz, Koolance Water Cooled, Dual Plextor16x DL DVD+/-RW. Dual WD 250gb 16mb Cache Sata 3.0. 3DMark06 score = 19,168.