Put a new system together for myself with a 300gb SATAII drive... In the windows XP install, it only detects ~130gb of storage. After install, the bios detects the full 300gb, but still only ~130 is accessible in windows.
install sp1 or sp2 and create new partition/s from the unpartitioned space , goto start-->settings-->control panel-->adminsitrative tools-->computer managment-->disk managment