I seem to be having a lot of questions lately. Although I am fairly well familiar with partition tables and such, I am still foggy as to where Windows XP (NT) stores the drive letter information. What I mean is that Disk Manager allows for changing the letter of a drive. Where in this information stored? I assume it is someplace in the boot sectors. In my particular case, I wanted to change the boot drive on my system. I backed up the C: drive and restored it onto another drive. This was done while booted from a "spare" installation of XP so that the Windows directory could be copied completely. I then removed the original C: drive and tired to boot. However, while it did try to boot, the disk was still assigned the letter E: as it was originally. I can, of course, do a fresh install of XP, or could go through a roundabout procedure where I install clean copy temporarily on another drive; boot from that; change the drive designations; then boot the original XP installation. Hence my desire to find if I can simply patch a byte on the disk using a sector editor (which I have). Thanks. Peter [log in to unmask] The NOSPIN Group has added a new feature on our website, web based bulletinboard for questions and answers: Visit our sister website at http://nospin.com