I've been putting this thing through its paces since I got it. Purchased specifically for a project that I just got hired to do. Well that project is over and now I'm using it on my next project. Basically I'm transferring and storing 200-300 new GB of footage on here in a weekly basis.

This is a quick drive as expected; Raid options are nice although I didn't end up changing from the settings as shipped fom the factory

There is no thunderbolt passthrough; The connector that holds the thunderbolt connector that connects to your computer is just a holder; There is nothing connected; I was hoping (didn't expect it) it would be an active pass-thru, but it was not; This is only a con if you are low on thunderbolt ports

I purchased this 4TB thunderbolt enabled portable hard drive because I needed storage with speed to use with iTunes. I have tried several setups for my iTunes library. I've tried several USB 2.0 connected external hard drives as well as a wifi enabled media center in other words accessing my iTunes...

Small form factor

Thanks to an enormous capacity in a still just handleable bus-powered package drive chassis, the WD My Passport Pro could prove invaluable for carrying huge volumes of data on the road.

I understand that this RAID drive saves two copies, one to either drive, but accessing the data is way to slow, far slower than two HDD that I have in a similar RAID setup. A poor buy.

A cheaper but slower alternative to a Thunderbolt SSD