Friends my motherboard is Asus P5Sd2-VM. I Just bought a new hdd WD 1 TB Green Edition. I use windows XP. My bios detects my both the drives but XP dosen't I mean I can't see any additional volume or drive whatsoever. I am crippled to my 250 GB segate drive.
The drive might not be formatted or partitioned, that's why it's not showing up. in start>run type diskmgmt.msc and see if the drive is shown there. If yes, then partition and format it. Create one primary partition and use the rest to create an extended partition. Then create logical drives within the extended partition. You will be asked the size, choose the size wisely as per your requirements as once you have put data on the drive you cannot change the partitions without losing data.