Go to drive manuf website and down load there HDD utiliies and check the drive.
Most Likely a defective drive.
For WD I only buy their "Black" models. Looking at the "Green" model it has a very High dissatisfaction rating @ Newegg, Like 33% 1 gg - ouch.http://www.newegg.com/Product/Product.aspx?Item=N82E16822136891&Tpk=WD20EARX
Compared too: http://www.newegg.com/Product/Product.aspx?Item=N82E16822152185
PS often onsale for around $60
Currently my drive of choice is the Samsung F3, but max size for it is 1 TB.
Use to buy the WB Blacks, but switche to Samsung's F3 for the last 3 that I've bought.