I just bought a laptop. It came with Windows Vista Home. I wasn't that happy with the performance so I decided to downgrade to XP. I used a USB to USB cable and formated the hard drive.
I booted from the DVD drive and during the installation got this error:
Setup did not find any hard disk drives installed in your computer.
Make sure any hard disk drives are powered on and properly connected to your computer, and that any disk-related hardware configuration is correct. This may involve running a manufacturer-supplied diagnostic or setup program.
Setup cannot continue. To quit Setup, press F3.