I need to transfer 9TB's of data of my multiple external WD Mybook hardrives to mynew computer i have just built. I was thinking of going with three WD 3TB Cavier Green drives, has any one else have any experience with these drives?? Also since the date wont be viewed much is it best to unplug them from the computer once full with data and just plug them in when i want to use them or do they go to sleep so to speak and only turn on when you go to 'my computer' and click on the drive???? Thanks so much in advance!!