I can't figure out the real market for this drive. It's not online high-volume; if your data needs to be online, then it probably needs to have reasonably high availability. That implies RAID, which then implies something like the 2 or 4 TB RAID Edition (RE yellow-label) drives, or the Seagate Barracuda XT. Blacks aren't well-suited for RAID, lacking TLER. It's not online performance; again, three or four 2TB drives in RAID 5 will give better streaming performance, and may also give better IOPS performance. It's not near-line storage either; for consumer-grade installations I would use the Reds, which seem to offer decent near-line performance with outstanding power management, and offer better RAID compatibility to-boot. For commercial-grade installations, again the REs, XT, or SAS drives just make more sense.
I fear that this may be a product without a purpose. For the consumer market, the largest consumer of storage space - video - is increasingly becoming streamed data rather than locally-stored data. And I cannot imagine consuming 4 TB of home video. TV shows? Yes, but at that point I'd shift to a home server RAID array anyway.