This should be fun - try and keep up ) P4 2.4Ghz 512MB DDR Asus MOBO GF4 TI4200 (128MB) Windows XP Pro Parition Magic 8.0 I have 2 HDD paritioned in 3 as follows Disk 0Primary) Windows XP Pro (C:/Windows) Disk 1: (Part 1 - Primary) XP Pro (C:/Windows) Disk 1: (Part 2 - Logical) Data/Backup OK my drives are paritioned as above as master and slave running on the same IDE connector. Before, I used to be to boot both independently (as in I could set the boot disk in BIOS and it would have no problem). I used to boot DISK 0 and also have my Disk1 (Part2) logical drive visible with my other XP hidden - or I could boot from DISK 1 (Part1) and again have my logical parition viewable and my other XP on DISK 0 hidden. Also, as both OS were hidden from each other, they both used to be installed on C:/Windows. I recently got a new MOBO and had to do a Windows installation repair on them both to be able to load them again. DISK1 XP wouldn't boot any longer - so as I had all my stuff backed up on my logical parition I thought - reinstall. Only now when I come to reinstall to DISK1 - it automatically detects my other OS on DISK0 and will only give me the option to install to D:/Windows (and not C: like before). But anyways.... I tried going along with the install, and no problem - until I come to boot. I tried changing my boot device in BIOS to DISK1 and I just keep getting an error saying NTDLR is missing. The only way to boot it up, is to boot DISK0 and select my other OS from there. This defeated my whole point of having two independent bootable hard-drives in case of one failing. I tried loading windows recovery console and using "fixmbr" - boot to no effect. I just can't boot from DISK1 I then tried formatting DISK1, erasing the parition and creating a new one again - reinstalling and had the same problem: On installation. It would automatically detect my other OS on a different drive and only give me the option of installing it to D:/Windows....... I also want it back on C:/Windows !! Then again - I get the same error: cannot find NTDLR etc..... Is there a way that I can install windows on DISK1, independantly of DISK0 and get it to install it's own NTDLR and install to C:/Windows. I've had it like that once before.