i hv Seagate BlackArmor 1tb (with eSATA and USB 2.0) support, i purchased this External HDD for 6.9K jus for back up (of my movies, mp3 and my game ISO (which are in excess of 250GB+)..lol... as i hv a lappy (core i3 based) and my rig (core i7, see siggy) so wanted a eSATA based ext hdd, as both my lappy and PC hv this port and also, it takes way way LESS time in transferring the game ISO;s (...ahem..) in eSATA mode than using the USB 2.0..
the choice is totally urs, as i wated to carry my games with me as and wen i travel, so i took an ext hdd, if u jus need a back up (with no or minimal carrying around) u can stick with an Internal hdd.. (wich is way cheaper than an ext one ..