- May 9, 2014
I believe ~9mm is ideal. Im not sure sentry can even accommodate 12 let alone 15mm drives. The Sentry website lists 9.5mm drives in the configurator. I think Seagate has a 2TB 2.5in drive that's 9mm. (double check that though, it might be 12mm).
Seagate actually makes a 2.5 2TB drive that is 7mm, Seagate 2TB Baracuda. I have one and it is a great compact storage drive.