The WD Black series is deemed solid. The 2TB hesitate sometimes to be recognized by the different operating systems, but needs to run continuously. Useful for backups. Excellent price / quality ratio. I take off a star for the "hesitation" because at this time, SSDs should be based on hard drives. But WD is well demarcated from Seagate-Maxtor whose records regularly let go, causing it to lose tons of data ...