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Not necessarily. For example you could have many read heads and read from the disk much faster by reading in parallel. It's complicated to do, but it is possible.

You can also increase the areal density, which means more bits fly past the head per second, which also increases speed, even though you can't increase the rotational or seek speed.

I would expect that's how they plan on getting to those ridiculous write speeds. Decrease the size of 1 bit so that more of them would fit on one track (a circle on a platter). They would be able to do that since the time to flip the region of the bit would be smaller. However, there is still the problem of finding a material with that much smaller magnetic regions. Which is already a problem in current drives (perpendicular recording) so I don't expect this to fly.

Increasing the number of platters improves read/write throughput independent of the low-level technology used. As far as increasing density, that only scales relative to the square root of areal density. If you increase density by a factor of 100 you only increase the number of bits per track by a factor of 10.

The same rules don't apply to mram, of course, but from the article I'm not entirely sure if these techniques are useful for such designs.

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