Can I use a single drive to back up one PC running Windows XP and another running Windows 7?

Hi, yes you can, if you use smartware it will create a separate folder for each computer. 

http://wdc.custhelp.com/app/answers/detail/a_id/3828/session/L3RpbWUvMTMzOTg3NzUwNi9zaWQvZmg0eEZRLWs%3D

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