What's the purpose of the pins besides the SATA connector in a hard drive 3.5"?

What's the purpose of the pins besides the SATA connector in a hard drive 3.5"?

In 2010 and 2011 iMac hard drives, this pins were a temperature sensor that is connected to the motherboard. I wonder what's the purpose in other non-Apple hard drives. I never saw these in 2.5" hard drives.

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Posted on May 12, 2016 8:29 AM

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12 replies

May 12, 2016 8:43 AM in response to rodion15

If those pins are what I think they are those pins setup a drive as "master" or "slave" drive when a computer has/uses more than one hard drive.

You need to have a small plastic isolator to cover the right pins so that the computer hardware/software boot ROM sees one of the drives as a "master" drive and the other drive/s as "slave" drives.

Apple uses these pins for connecting up the temp sensor in Macs, since iMacs only have one installed hard drive.

May 12, 2016 9:20 AM in response to rodion15

No.

Older computers used these to connect up hard drives and optical drives.

They carried both electrical power and data input/output throughput for the drive.

I used to deal with these all the time when working/upgrading different types of tower Macs, I've seen these is G3, G4 and G5 PowerMacs and early Intel Mac Pros.

These connector pins carry both power AND data throughput.

I always called these SATA connectors.

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What's the purpose of the pins besides the SATA connector in a hard drive 3.5"?

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