I have a 2011 1TB iMac which i have pretty much maxed out. I am looking to get an external HDD which i can use to host my iTunes Media folder. I have a couple of questions... 1. If i have an external HDD (single HDD) how will this be affected by the iMac being put to sleep all the time? I regularly put my imac to sleep. 2. I'm aware of RAID discs, but i'm not really looking for a backup - therefore is there something similar so that i can add a disc, but once that gets full i can add more to it in the same way you can have a 4 disc RAID array? 3. Am i able to get my media folder across several HDDs or do i need to buy a large 2TB+ single disc? 4. has anyone had to do this before? 5. i'll be streaming movies etc to my atv2 - does it matter if the external drive is connected to my iMac by usb, thunderbolt etc? 6. does anyone have any suggestions for drives i should look at? Ideally I'd have liked to have a macMini as a media server, but in the UK they are too expensive and also they have at most a 1TB drive. thanks!