So you attempted to find the drive in Admin tools/Disk management out of control panel? Generally, if a drive has lost format recognition, it will show up in Disk management as "unallocated" and the drive Icon will not display in My Computer until after it is allocated in Disk Management.
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.