I have read many threads on here about similar problems, but none have helped me. My set up is as follows: Windows XP,SP2 4 sata drives (2 500GB, 2 300 GB) Acronis TI v9 I have successfully cloned my 300GB sata drive to a 400GB sata drive. I remove the old drive and replace it with the cloned drive (ensuring that it is now the master drive to boot from in BIOS), all boots up initially, drives identified, and the Acronis f11 screen appears. Then I get a series of MBR errors: 1, 2, 3. I am then instructed to boot from floppy. I have tried cloning on 3 separate occasions, and also done so from disk image, and each time this happens. I have also used Norton Ghost and get the same error. Reading the forums I have read of similar problems, and tried many of the remedies: Windows XP fixmbr...that got rid of the MBR errors, but then I get the error: "Invalid Operating System". I have also tried cloning from the rescue boot CD only, same error. I have tried removing all other hard drives, same error. Furthermore, when I put my original hard drive back in, it no longer boots up properly, but either hangs on the Windows log in screen, or I get the blue screen of death. I then have to image the drive from a back up to get it working again. Please, somebody with knowledge of this problem, point me in the right direction, as I am close to insanity with this. Thanks in anticipation.