I have a hard drive that was recently working. Windows XP crashed and I tried, unsuccessfully to reinstall Windows. First, I tried to use a single disc copy I had been given some years ago. I did not have a unique key code, so that install failed to complete. Then tried to utilize the recovery discs for the Compaq desktop computer. These are the original discs. The hard drive is a replacement. I had used the recovery discs successfully on this hard drive already this spring. I decided to try the other XP copy first to avoid the bloatware that comes with the OEM disc set. The setup with the recovery discs failed, so I tried to format the hard drive and start over. I pulled the hard drive from the desktop, and tried to format it as an external drive via a SATA to USB cable. The functioning computer (also running XP) recognizes 6.3G of the 250G total disc space. I am guessing that this was the partition made during the XP install for the recovery section. When I attempt to format (NTFS), the format utility runs through the process and then errors out at the end "can not complete the format". The hard drive spins up and sounds fine. I realize (now) that I should have just used the recovery discs first. How can I repair the hard drive so that I can reinstall Windows XP?