Samsung 840 Pro or Evo or ....

[Neiloid]

I think you made a good choice!

Both drives should fit OK, if the 2 TB drive fit with its bigger dimensions (albeit without being mounted), as per previous posts, the 10mm should be no problem either, as the EVO is 7mm thick. Not much difference between 9.5 and 10mm. You should be able to screw it in too. Are you sure it is 10mm, not 9.5, which is standard?

As far as positioning, it does not matter what bay you mount the drives, as you will select the boot drive anyway in System Preferences. Both SATA ports are 6 Gbs, so the SSD will work in either upper or lower (same for HDD).

Some earlier 2012 model Mac Minis had the drive in the Lower bay (the one attached to the WiFI grill, upper when you turn it upside down to work on it), but later in the production run Apple changed it where the drive is mounted in the Upper bay (relative to upside down Mini, the bottom bay...confusing, huh?), with the bay below the WiFi grill empty.

As far as I know, all 2011 Minis had their drives mounted in the "Lower" bay under the WiFi grill. Again, should not matter which one is mounted where, however, when I upgraded my 2011, I kept the HDD in the "Lower" bay, and mounted the SSD in the Upper bay, because it was empty. Boots fine from SSD. Again, should not matter.

This is the HDD I'm looking to instal and according to Amazom it's 10mm thick but I'm sure that 0.5mm will be too much of a problem I want this one as it's 7,200 where as most seems to be 5,400 http://www.amazon.co.uk/HITACHI-0J22423-Travelstar-7K1000-Drive/dp/B00B4QESVQ/ref=wl_it_dp_o_pC_nS_nC?ie=UTF8&colid=10XG2Q9KH67KQ&coliid=I2NYZEJGHJ2DU

Thanks for your help.

I plan to put the new HDD in. Copy the stock HDD over then replace that with the SSD and do a fresh instal Mavericks onto it and remove Mavericks from the HDD. Does that sound about right?