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Most computers now offer you a boot selection screen when you are starting up your PC. I hit F12 when prompted to get this.
Instead of relying on a boot menu if you are going to install to a second hard drive, I recommend that you do this method instead.
Unplug the molex power connector from the drive with your current OS on, this will have the effect of making your PC not see it. Your Bios should automatically move the second hard drive up the boot order but in case it doesn't go into your bios and make it the primary hard rive.
Install Windows XP as you normally would and set-up the hardware drivers and software you want before shutting down your PC again.
Reconnect the molex power connector and restart your PC, go into your bios and make the hard drive with the OS you are likely to use the most the primary.
Now you have a dual-boot system where you can boot into each operating system but neither OS has written any boot information onto the other, meaning you can safely remove or format one of the drives at a point in the future with no ill effects on the operating system on the other.
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