Excerpt: Bought for a 2012 I7 iMac. Was tired off buying USB 3 hubs that didn't work with various drives. Construction typical WD - plastic but strong. Feels Solid. Thunderbolt expensive but speed and daisy chaining great not to mention leaves USB ports open for other devices. Drive A failed in the first 4 days. Program warned and now I need to replace drive. No longer being in the US I wasn't sure about replacement warranty but phoned local WD dealer.
Summary: This My Book external drive has a Thunderbolt connection, so it's mostly for Macs and a couple of PCs made by Lenovo that sport the Thunderbolt port. I use it with my MacBook Pro. Thunderbolt plus the fast drives in this product is just incredibly high-performance. I can back up the 300GB on my MBP in 20 or so minutes, vs. estimated 7-8 hours over USB 2.0! It seems even faster than USB 3 SuperSpeed. The drive came as a RAID 0 "striped" setup, for speed.
Summary: Bought this a few years back after a handful of failures with my 4TB Seagate drives. Wasn't a big fan of Western Digital for a few years do to subpar products but I have to say they have changed my mind with this drive. I purchased the 8tb version with the thunderbolt connection. Its been flawless since the start, quiet as can be, and the software that comes with it for the MAC works perfectly and updates regularly.