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Can I put my hard disk (with OS) from a Macbook pro Early 2009 in a Macbook Pro from 2011 without problems? (And put the hard disk from this 2011 in the one from 2009 without any problems?)

Like software errors or other complicated things? I just want to re-use my hard disk without problems.

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What version of OSX are you running on either one? I know you can start up from one plugged in on USB, but I don't know about internally as well – Canadian Luke Dec 23 '11 at 18:19
OS X 10.6 My concerns: Software issues Hardware issues – user1113803 Dec 23 '11 at 18:22

With OSX 10.6, you should be able to pop the hard drive into another Mac and have it boot up with your current software and configuration running

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