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Thread: MPI 360k won't read/write

  1. #51
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    Ok so I attempted to center the head just a bit more. Now, it will format, copy files, and run files copied on that disk. The other drive can read the directory but of course cannot open any of the files. So is this where I should stop messing with the head and look at that pot?

  2. #52
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    No, you need to look to the alignment, now. (Format, write, read) on the same drive means that the drive is operating more-or-less correctly. Not being able to swap disks between drives means that the alignment is messed up.

  3. #53
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    Ok.. so for noobsplaining purposes, when we speak of alignment are we speaking just of the physical head alignment? Are there likely to be any further PCB adjustments?

  4. #54
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    Nothing on the PCB. It's purely a relative positioning issue.

  5. #55
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    Thanks Chuck.

    Am I safe to presume that the lower head, being untouched, is aligned ok?

  6. #56
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    I can't say that for certain. The head assembly is a complex system. The only way to have an inkling is to use something like IMD and check each head individually.

  7. #57
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    Ok. I'm running IMD test rpm and it says 272rpm on that drive.. does it need to be 300rpm right on?

  8. #58
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    Ah. So that pot I was messing with controls RPM. I dialed it in to about 299 rpm... which is what the other drive stabilizes at.

  9. #59

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    With the disk out, carefully lower the head down by closing the door slowly. Most double heads have opposite flat sides such that only a narrow part overlaps ( the width of a track ). You don't want to close the door any more than just touching or you can chip them.
    If both heads are completely rounded, they will be more difficult to get the tracking right. Often the heads are the same width looking at them straight on. you can get the right left close that way but in and out they are offset to just overlap.
    Since you haven't messed with the other head, it is likely in the right place.
    Good luck
    Dwight

  10. #60

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    Forget what I just said, you drive has three pots.
    Dwight
    Last edited by Dwight Elvey; August 17th, 2019 at 10:57 AM.

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