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[KILLorBE]

If you use it on your 360 it will transfer all data from one HDD to another and leave you with an empty HDD.
Also see:
http://forums.xbox-s...howtopic=695177
and:
http://www.xbox.com/...tamigration.htm

If you use it on your PC you can use it as many times as you please....or until it dies.