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Yeh you can add any 2.5" drive alongside the 3.5". You can even add two 2.5" drives if you remove the optical drive.
 
I want to maximize my internal storage before I have to go external. My PPC G5 only has an 80 GB drive and I have two external USB drives. External drives are fine except that they are another thing to plug in, find room for on a desk, be something that collects dust, and be something that can get knocked around (at least in my case).

Is the 2011 iMac limited to using 1 TB drives or could I use something bigger?

-- Boris
 
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