I have XP Pro on my PC. I want to keep 2 copies of XP. One for daily use and one for gaming. I have experience with grub so I thought I could just dual boot the xp by hiding one partition each time. Not so! I used gParted to shrink my original NTFS partition and copy it to 2nd partition. So now I have 2 identical partitions. I hided my 1st partition. Set my 2nd partitions to boot (I want both of them to be C: and don't want to seeing each other). XP boots up with its splash screen and halted with the following error. autochk program not found - skipping AUTOCHECK It appears that XP still remembers its partition number. I don't know why it do that and don't know how to get around it. I even followed the walkthrough as decribed here. I used win98 CD to fdisk/mbr. I ended up with a "missing operating system when trying to boot 2nd XP. I have to fix by logging back into to 1st XP's Recovery and fix the MBR. I then removed MountedDevices, clone again, and even changed BOOT.INI to point to partition 2. I still ended up with same error.