Just a note about WD external drives. Without exception, they have WD Green drives inside, and those drives have a 1 year warranty.
Black (5? years) and Red (3? years and NAS) are MUCH better!
Also, (WARNING, this will VOID your warranty on the enclosure) you CAN put a better drive IN the enclosure, to improve longevity. Note, you will have to remove the drive to do a RMA ON THE DRIVE.
Yes, I DO have a couple Red drives in external cases. Works JUST FINE.