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Apple Computing Products:
macOS - Desktop Hardware
Late 2009 iMac - Need to replace hard drive, unique problem!
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<blockquote data-quote="techiesteve" data-source="post: 1425106" data-attributes="member: 98520"><p>The 20" and 24" aluminium iMacs used a sensor held under a black plastic clip. This changed in the 21.5" and 27". A 2 wire lead from the logic board mates with a connector on the SATA HD, the sensor is part of the drive. Apple may have used 3 drive manufacturers, Seagate, WD and Hitachi. Seagate and WD are more popular. Each manufacturer uses a different style of connector on their drive. If you leave the sensor off the fan speed slowly ramps up and becomes unbearable. I've successfully replaced Apple WD drives with retail WD's, but with Seagates no luck. I suspect something in the firmware in the Apple Seagate drives. At work we now replace Seagates with Apple drives, expensive. I vaguely remember seeing a reference to remembering to move over a shorting link on the HD temp sensor socket when replacing logic boards that have SSD's fitted. SSD's don't utilise the temp sensor. I've never seen this linking plug, so I've no idea if it is only a shorting link or something else. The current iMac models no longer have a visible HD temp sensor lead.</p></blockquote><p></p>
[QUOTE="techiesteve, post: 1425106, member: 98520"] The 20" and 24" aluminium iMacs used a sensor held under a black plastic clip. This changed in the 21.5" and 27". A 2 wire lead from the logic board mates with a connector on the SATA HD, the sensor is part of the drive. Apple may have used 3 drive manufacturers, Seagate, WD and Hitachi. Seagate and WD are more popular. Each manufacturer uses a different style of connector on their drive. If you leave the sensor off the fan speed slowly ramps up and becomes unbearable. I've successfully replaced Apple WD drives with retail WD's, but with Seagates no luck. I suspect something in the firmware in the Apple Seagate drives. At work we now replace Seagates with Apple drives, expensive. I vaguely remember seeing a reference to remembering to move over a shorting link on the HD temp sensor socket when replacing logic boards that have SSD's fitted. SSD's don't utilise the temp sensor. I've never seen this linking plug, so I've no idea if it is only a shorting link or something else. The current iMac models no longer have a visible HD temp sensor lead. [/QUOTE]
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Apple Computing Products:
macOS - Desktop Hardware
Late 2009 iMac - Need to replace hard drive, unique problem!
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