If you had asked me a few years ago, I would've said that hybrid drives will be the next big thing in the storage industry. A hybrid drive made so much sense -- it combined the performance of an SSD with the capacity of a hard drive in an affordable and easy to use package. WD's Black2 takes a different approach and instead of being a hybrid drive, it's a dual-drive with full user control of the SSD. Is it a better concept than the hybrid drives we've seen so far? Read on to find out.