I have an ASUS P4P800-MX motherboard with two SATA interfaces onboard, and they allow 150 MB’s data transfer. I have an EIDE WD 160 HD that works fine, that I have my Windows XP pro working on. I recently purchased from EBAY a SATA “second generation” drive model WD1600AAJS. I have placed a jumper on the SATA drive to lock this drive at 150 MB/s data transfer rate in order to work with my motherboard. When I run disk management, I can see this SATA drive, but there is no driver letter attached to it. I have also downloaded a Western Digital utility program that will see all drives attached to my motherboard. Disk Management has partitioned this SATA drive, but will not give me the option to format, and the Western Digital utility has examined this drive and says working properly. The question is “How can I get a drive letter assigned and how can I format this drive?”