OK, I finally figured it out. I discovered Computer Management in the Administrator's tools on XP Pro. Next, discovered that all disks are not necessarily drives. Both were listed as Basic Disks, but only HD1 was listed as a drive. I noticed the difference in System Information. Back in Computer Management, I finally figured out that by looking at different Views of the 2 disks, one of the views gave me the option to change HD2 to a dynamic disk. As of that time, HD2 did not have a letter id. I made it a dynamic disk and then was able to assign a letter to it; the system chose E: and left the CD at D:. Fine with me. Then I was able to transfer all of my precious data and other goodies from HD2 to HD1 (finally) and then format HD2 as NTFS in Windows Explorer so that I can install XP Pro on HD2 also. Then I can finally make HD2 the boot drive and use HD1 for backup, my original plan. That's where I had to stop because when I tried to install XP on E: from C: there was not enough clear info on my options to make me comfortable that with a new install, I was not going to reinstall the OS on C: again, wiping out all of. So I quit to be safe. Now, for the last step, I have to figure out how to install XP on E: starting up from C. I have the entire install CD copied onto both C: and E:, but when I've tried to install to E:, I'm not sure it's going there. I tried to use a Win98 startup disk to get to a C: prompt and go from there, but I guess you can't install XP Pro from DOS. So, that's where I am now. I sure appreciate all the help and great suggestions. If anyone has my final problem figured out, you'll be my hero. Thanks.