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The big question with this unibody Mac Mini: "Can I install a second hard drive myself?" The centimeter and a half of extra space seem to imply so.
There is definitely plenty of room for a second hard drive underneath the first. The only deterrent is the availability of a second, longer SATA hard drive-to-logic board cable.
Update: We include that cable in our Mac Mini Mid 2011 Dual Hard Drive Kit.
Let's get the logic board out so we can get a better look.
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