My back up and storage needs have prompted me to explore faster larger capacity options. Currently use a 1tb wd my book with usb that I use for time machine back ups. My mid 2011 iMac has 500gb and at 450gb, almost full. Can I use this for a new and faster external hdd for storage? http://www.amazon.com/gp/aw/d/B00E6N9HEC/ref=mp_s_a_1_1?qid=1416684576&sr=8-1&pi=AC_SY200_QL40 I want to free up my internal hard drive all together. iMac Performance is sluggish.