Currently in my system: C drive 30G PATA harddrive with Windows XP including 2G partition G drive 160G PATA harddrive for storage The 30G is starting to make some noises, and was getting small anyway. New 160G SATA harddrive to replace the 30G. I use the ATI trial to clone the C drive to the new drive, the system reboots into the program for cloning the drive, everything goes fine, takes it's time to get to the press a key to shutdown. System shuts down, I remove the cords from the original C drive, set the jumper on the other PATA drive to master, plug the proper end of the IDE cable into the G drive, then start the system. I go into my bios, and set the harddrive priority to SATA first, PATA second, save and exit, wait thru the screens, and it tells me "Missing operating system" Could someone tell me what I'm doing wrong? And if They reference the article about XP designating drive letters, maybe someone could explain that one in english, too full of tech talk for me to make heads or tails of it.