I've heard WD allude to their surveillance drives having some kind of firmware optimizations to handle multiple streams of writes with good QoS. It seems plausi

I've heard WD allude to their surveillance drives having some kind of firmware optimizations to handle multiple streams of writes with good QoS. It seems plausible they they would have a bit of a different write caching strategy based on minimizing seeks and trusting that the data coming into the drive is interleaved from multiple sequential write streams even though at any given moment the command queue will look like a bunch of random writes.