Best meaning what? Cheapest? Quietest? Least amount of heat? Best varies for each persons environment. I have no issue with the WD green drives. They are quiet and keep heat levels low.
Ok thank you for your response, please see this thread which is what led to my confusion: http://forums.dlink.com/index.php?action=printpage;topic=23234.0.
I am looking at this hard drive please can you give me your opinions of compatibility with the 320: http://www.ebuyer.com/product/182435
Or
http://www.ebuyer.com/product/183971
Please assist, and thank you so much for your help kind sir!!!