So I've decided that I'm going to upgrade my 27" 2011 iMac to the new 2017 (base or mid) 512gb ssd version. As I have more that 512gb worth of data, I'm going to have to get a 1/2tb external SSD or HDD. Question is should I go for something off the shelf like a Samsung T3 SSD 1tb, or a bare SSD/HDD and put it in an enclosure or a dock? I do have a 1tb WD blue 2.5" HDD sitting in my PS3 that I can take out and put in a USB3 enclosure. EDIT: I run my 2011 iMac (OS/apps) off an external TB adapter with a 120gb Samsung EVO 850. Data is on the internal 3tb HDD.