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Thread: MFM drive - why an odd number of heads?

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    Default MFM drive - why an odd number of heads?

    I think it is a ST-4038 that I have, but it has 5 heads. Why not 6? I read something about the extra side being used for locate tracks or something, but if it uses a stepper motor to move between tracks, is that necessary?

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    Quote Originally Posted by alank2 View Post
    I think it is a ST-4038 that I have, but it has 5 heads. Why not 6? I read something about the extra side being used for locate tracks or something, but if it uses a stepper motor to move between tracks, is that necessary?
    One surface is used for a servo track. This series of drives uses a linear motor for head positioning.

  3. #3

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    Is the ST-4037 the same thing (or IBM version of) the ST-4038?

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    Quote Originally Posted by alank2 View Post
    Is the ST-4037 the same thing (or IBM version of) the ST-4038?
    The only reference I have that lists both refers to the ST-4038 as high performance and RLL capaable so it is likely that the 4037 is a slightly slower cost reduced model.

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