The differences are dimensions, but more importantly is the latching mechanism on the front of the carrier.   12th gen [IMAGE]               14th gen [IMAGE]  
Hello, For the next planned upgrade: is it possible to buy and install Samsung PM1643 3.84TB 2.5" SAS SSD instead of the existing SAS HDDs? Do we need a special caddy for R820? Other known issues?  Thanks!  
R820 and Samsung PM1643 3.84TB 2.5" SAS SSD ... compatibility