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Dual-booting on separate hard drive w/out integrated loader
Essentially, I'm trying the unplug OS drive method. However, I'm running into some problems. I have an existing Windows 7 installation and want to install Windows XP as a completely discrete installation without combining the bootloaders (and just accessing via bios). The problem is that when I plug my OS drive back in, it skips the XP installation and immediately boots into Windows 7. So, I tried a bootloader and found that somehow the XP installation was missing ntldr, etc. I don't understand how this is possible seeing as how it was installed on its own, separate disk. It happens each time I try it. Is it possible that XP is writing the boot files on another internal drive (I have 4)? Would I need to unplug the other drives (I think the disk number for the XP drive is #2, whereas Windows 7 is the 0 drive)?
Thanks in advance