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

By rodion15
May 12, 2016
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  1. In older drives, these were for master/slave. 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.
    Last edited: May 12, 2016
  2. SNGX1275

    SNGX1275 TS Forces Special Posts: 10,742   +421

    They were used to make SATA II drives compatible with early SATA motherboards that could only do SATA I speeds AFAIK.

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