Both drives NTFS? If one is fat32 and the other NTFS your system will not read the drive until it is allocated. Go to Control Panel>aAdministrative Services>Diskmanagement and see if the drive appears on the right. If it does and it appears as unallocated you will need to right click on that dirve and allocate it as NTFS and format it.
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.