I'm very happy with the Drobo 5D. Easy to set up, I don't have or want a computer science degree... RAID 5 means relax, you have redundancy if a drive fails, and Thunderbolt really does make a difference... I used 5 x 3 TB Seagate Barracuda's. Would probably now go with Hitachi's HGST if I had to do it again, and there are now plenty good 4 TB drives (WD Black), but have had no problems with the Seagates. In the field I use their Thunderbolt adapter bolted to a 1TB 2.5 Inch Drive for Temorarily storing Oddysey 7Q files, if needs be. I also use the Seagate Adapter with the Oddysey SSD's.

Whatever one does, back in the studio, redundancy is a must, if you want to sleep peacefully at night, so your system must either use RAID1to mirror the drive, in a 2 disc system like WD MyBook Duo, or a 4 or 5 Disc System, Like a Drobo 5D or Pegasus, etc. use RAID 5. Also, one needs to use 7200 rpm. drives for editing... HGST drives have the lowest failure rate, apparently...

It is my understanding that when shooting 4K video, that equates to approximately 8 megapixels a frame. Aren't lenses far lesser than this expensive beauty 'out resolving' our current video needs?