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Thread: ST-225 speed up and down?

  1. #11
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    Other things that will cause the spindle motor to shut down without restarting include a bad servo track on drives that use that positioning technology. The drive is then essentially trash, as there's no way for the hobbyist to rewrite a servo track.

  2. #12

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    Quote Originally Posted by Chuck(G) View Post
    Other things that will cause the spindle motor to shut down without restarting include a bad servo track on drives that use that positioning technology. The drive is then essentially trash, as there's no way for the hobbyist to rewrite a servo track.
    On MFM drives? Isn't that what we have here?
    PM me if you're looking for 3" or 5" floppy disks. EMail For everything else, Take Another Step

  3. #13
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    This is the 225. While it does have an onboard microcontroller it does little to monitor drive health. It also has no comprehension of what pre-existing data might be on select tracks or regions for calibration and relies heavily on the host controller to make those decisions. It doesn't even have the smarts to auto-park yet, let alone blink the LED if it detects a fault. I still blame a thermal issue with something in the motor drive circuit, or the DC-UNSAFE trigger is resetting the microcontroller and perhaps it's spin cycling?
    = Excellent space heater

  4. #14
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    Nov 2008
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    Well it looks like replies are all over the place.

    More info, drive sounds fine when running. I had another st-225 and have install it. It runs fine in the system. Feeling like the drive is OK I going to keep the drive and keep my eye on finding another ST-225 that I can use the controller board.

    I was hoping it might be a known problem. Thanks for all the replies it helps confirm what to do.

    framer

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