My drive just stopped being read as an os, i have windows 8 on it, msi picks it up as a drive, but then some 2.2 tb program says searching for bootable drive, i reset bios to fail safe, and still nothing.
could you test it as a external drive in another system using data lifeguard diagnostic from wd this will tell you is the drive is defect so if it still under warranty you could ask for a rma with the code the test will give .