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Macintosh HDD Maintenance
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=== ROM or controller failures === * Drive spins but is not recognised? Run '''HD SC Setup''' before suspecting hardware โ a stale driver presents identically.<ref name="hdss">Apple Computer, Inc., ''Hard Drives Service Source'' (SCSI drives and IDE drives): Troubleshooting → HD SC Setup; Upgrades → "Drives in Quadra 900/950" and "Identifying 20SC Rev A & B"; Additional Procedures → Carrier Removal, Torque Sequence and Modifying 5.25-Inch Drives. Hosted on this wiki as [[:File:Macintosh Disk Drive and UniDisk 3.5.pdf]] — the file name on this wiki is wrong; the document inside is the Hard Drives volume.</ref> * Then check SCSI ID conflicts and termination, which present identically again. * Only then suspect the drive's own logic board. Replace with an identical board from a working donor; on drives of this era the board carries drive-specific adaptive data, so a board from a different revision may not work even if it fits.
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