I'm dual booting XP and Win7 on a Dell Latitude D520. I'm trying to install Win7 on an external hard drive to free up space on my internal disk. When trying to install Win7 on the external drive, it says "Ensure the disk's controller is enabled in the computer's BIOS menu." However in my BIOS menu I see no option for this. I've looked like 5 times. Is there any way to resolve this?
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