75ZT CommunityA social community of enthusiasts, owners, appreciators and collectors. With expert knowledge of all things from MG to Rover and beyond.2011-09-23T22:13:05+00:00https://www.75ztcommunity.co.uk/feed.php?f=29&t=4251&mode2011-09-23T22:13:05+00:002011-09-23T22:13:05+00:00https://www.75ztcommunity.co.uk/viewtopic.php?t=4251&p=38277#p38277 A 3.5" hard disc will require its own power supply, whereas a 2.5" HDD gets its power via USB/FireWire. USB 3.0 is way faster than 2.0, but can be used with a USB 2.0 only PC too (obviously slower).