Editing Atari Mega ST Troubleshooting (section)

=== Floppy Fault Table ===

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|+ '''Floppy Drive Symptom Diagnosis'''
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! Symptom !! Possible Cause !! Recommended Action
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| Drive recognised at boot but cannot read any disk || Dirty or worn heads; head alignment out of spec || Clean heads with IPA. If still failing, the drive mechanism may need replacement
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| Heads seek continuously without reading || Stepper motor or head carriage failure; track 0 sensor malfunction || Check track 0 optical sensor. Try a known-good drive
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| Drive not detected at boot (no drive icon) || WD1772 floppy controller failure; cable fault || Verify cable continuity. Check WD1772 for clock and chip-select signals
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| Intermittent read/write errors || Marginal PSU — voltage drops during motor spin-up || Measure +12 V under load. Recap PSU if below 11.5 V
|}