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IBM PC AT Maintenance Guide
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== Hard Drive == * '''CMI 5616''' (20 MB) and '''CMI 6426''' (30 MB) drives, shipped on early ATs, are famously unreliable. Many enthusiasts retire them in favour of more reliable replacements such as the Seagate ST-225 or ST-251 with an XT-IDE or modern SCSI/MFM adapter. * If the hard drive is not detected, suspect: dried-out spindle bearing (drive does not spin up), head stiction, bad MFM cable, controller card seating, or PSU output sag. * Do not attempt to low-level format an unknown drive without verifying the head/cylinder/sector geometry against the drive's label or the AT SETUP table.
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