PFC wrote:

Why do you claim that 'More platters also means slower seeks
and generally slower performance.'?

More platters -> more heads -> heavier head assembly -> slower seek time
    But..
More platters -> higher density -> less seek distance (in mm of head movement) -> faster seek time

More platters means more tracks under the read heads at a time, so generally *better* performance. All other things (like rotational speed) being equal, of course.

--
Guy Rouillier

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