Hi, Recently I bought a external Hard drive for the first time ever, i got a G-tech Raid 2tB mini. I had a bit of a bad experience and to cut a long story short I sent it back and got a refund. It was too noisy and seemed to slow my mac down. So, I'm wondering which external HD do I try next? I know now not to buy Raid. Due to my bad experience I feel cautious about buying one. The reasons why I'm want an external HD, are mainly because I need a bootable backup for my mac and I need to be able to restore. I also would like minimum 2 TB and to be able to make partitions in different formats, including windows. I do alot of photography and photo editing, so I don't want it to start making a noise when I'm using my photo editing software as this can be extremely distracting. I'm considering a Samsung M3 Slimline 2TB USB 3.0 or 4TB. Can anyone offer any experience or advice on this matter? Also my imac is mid 2010 and i'm running yosmite.