Agreed. I've thought of that too. Maybe having 1 arm share the platters makes that slower, since blocks are mapped differently for errors etc. Hell I don't know

good, might bring SSD prices down a bit

I still wonder why I have never seen anything in reviews about HDDs exploiting multi platter parallelism to boost throughput. That whole complexity argument looks pretty thin when you see an SSD with 10 internal channels going for £300.

Some HDDs use 5 platters, if they put an internal RAID manager that would boost read write enormously on large capacity HDDs for much less money than an SSD. Am I missing something? Why am I the only one who thinks this is a good idea?