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Message: <blockquote data-quote="bobtomay" data-source="post: 1627146" data-attributes="member: 24160">You're lucky - it's a little unusual that a Mac will boot off the drive from another one unless they're both the same machine.  OS X has this habit of only installing hardware drivers needed by your particular system.Based on the used and free space on that drive, even after deleting another 60 GB, you're still sitting at 188 GB - too much for the 160 GB drive you have.  I wouldn't put more than about 100-110 GB of data on a 160 GB drive.  With that much data on your existing internal drive - instead of figuring what what you're willing to part company with, personally, I'd be putting a new WD Black 500 or 750 GB drive in the MB ($52 or $62 at amazon - and 5 yr warranty), maybe longer than the MB will last).And if you don't have a backup of that drive - I'd be doing that sooner than later.</blockquote>