I'm having a problem using the ATI Boot disk to validate a backup made from the desktop environment. I used ATI 9.0.3677 from the desktop to backup my 80GB system drive (c: drive) to a 40GB backup drive (d: drive), both drives are Western Digital standard EIDE drives, and I split the archive files into 2Gb .tib files. I then copied the two resultant files to my Western Digital MyBook 500GB self-powered external USB drive. My system is an Asus P4P800 SE mobo using the Intel 865 chipset. I also have an additional 500GB SATA raid drive(s) for storing edited video files, but I don't believe that is a factor in this problem. All backup files on both the internal and external drives validate just fine when using ATI from the desktop. When booting from the ATI BootCD, made using ATI 9.0.3677, I can validate the files on the internal backup drive in both safe and full modes. However, I can't see my external USB drive in safe mode. When booting from the ATI BootCD, made using ATI 9.0.3677, in full mode I can see the .tib files on the external USB drive, but I get error E00070020, "corrupt archive" when attempting to validate. Surprisingly, while in that same mode, whether I reboot or not, I can validate several other .tib archive files on the external USB drive previously copied from a second PC! Those files were also backed up also using ATI 9.0.3677 with the archive files split into into 2Gb files. Why would archive files copied from the same computer to an external USB drive not validate when using the BootCD, but other archive files copied to that same external USB drive from a second PC and using the same build of ATI, will in deed validate using the same BootCD? Go figure. So then I burn the files from the external USB drive (files I couldn't validate using the BootCD) to a DVD using the desktop and Nero. Lo and behold, after booting from the BootCD in both safe and full mode, I can validate those supposedly corrupt files that were later copied to DVD. Go figure! Trying to narrow the problem further, I attempted to boot from the second PC using the ATI BootCD to validate the same archive files on the same external USB drive. I could boot into the safe mode and verify the archives from an internal backup drive, but I could NOT see the external USB drive. And, I could not even boot the second PC into the full mode. But, that's a problem for another thread. I suppose that some might argue that I can simply off load the archives to DVD. True, but at some point the archives may need to span more than one dual layer DVD, and I wanted to avoid the whole silly scheme of having to flip flop the last CD first. I would appreciate any help and I thank you in advance. It is not my intent to play "stump the expert". I'm just frustrated, lost and not sure what to try next. A loyal ATI fan, Lee.