Whats with 360 hdd?

2097

sonic springboard
Hey there.

I was recently playing gears of war 2 on my 360 and i had completed the campaign on insane difficulty and got the achievement etc. Then later on i got to rank 7 through horde mode. I then decided to bring my hdd to my girlfriends xbox and play some more there...only problem is that it says i havnt completed the game on insane and my rank is only at 3??? wtf???

Anyone know why this is??

This 360 protection shite is confusing me...
 
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