Wd green caviar 3tb internal Hard disk have the lowest life expectancy it did not even last for 2 years and it’’s among the slowest hard disk around 5400 rpm speed it should be enough but at some time it’’s really slow down. When you use is as a bootable drive it’’s gonna last for less than a year or two, so avoid it an go for wd blue 2 tb or 4 tb Blue avoid 3 tb from all brand.