i have the Dell E520 with vista home premium, 4 gbs ram, 1. 320 gb sata hd, and i just put in my old drive from my other computer 250 gb sata hd. the BIOS reads the HD fine, and passes all the diag tests. but vista will not recognize the drive. It show the drive in device manager, it shows it as working properly as well. When i goto disk management, it shows my disk as dynamic and it i try to change it to basic it says it will format the hd. What should i do? i also have Serial ATA AHCI Bios Version ISRC 1.02.23, and my 2nd drive is WD2500JD.