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Hello, people. I am from India and I have a 27 inch iMac late 2012 EMC 2546. I purchased Samsung SSD 850 Pro and I am looking to replace the internal SATA hard drive that came with the system. I approached the apple service guys and they said they will do it for a nominal cost but I have to provide them all the necessary components. I have a few queries with regard to this.

  1. Going through all the posts in the forum, I understood I need an 2.5 to 3.5 HDD adapter. I am confused in selecting one. Could someone please give me a few options?
  2. If I am changing the hard drive, should I be getting thermal sensor cable? What is the use of it? I just read that for MacOS El Capitan and Sierra, you wouldn’t need the sensor cable. If I am missing something apart from these two, please guide me. Thanks in advance. Regards.

Here’s the guide for replacing it: iMac Intel 27" EMC 2546 Hard Drive Replacement Here’s what you need for the temperature sensor issue: https://eshop.macsales.com/item/OWC/DIDI… Here’s the caddy you will need: https://eshop.macsales.com/item/OWC/SSD2… If you want to add an SSD flash drive here’s how that’s done: https://eshop.macsales.com/item/OWC/SSDI… Installation videos are on this page.

  1. The sensor cable measures the temperature of the HDD. One fan in the Imac is only for cooling the HDD. If unplug the sensor the fan will spin at 100% (very annoying). Some SSD´s work with apple sensor some not. But you can also unplug the fan.
  2. You can use any rack 3.5 to 2.5 for an iMac. They all fit.