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Model A1418 / Mid 2014 / 1.4, 2.7 & 2.9 GHz Core i5 or 3.1 GHz Core i7 Processor

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How to install iMac Intel 21.5" (Late 2012-Late 2015) SSD Temp Sensor

I have a 2014 EMC 2805. The hard drive area is very tight, I cannot figure out how to use the adapter with the limited amount of space. I have a plastic housing to the left and the fan to the right and top of the hard drive. The hard drive orientation is right to left, not top to bottom. Does anyone have a work around?

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Back in 2012 when the newer thin series cases where introduced Apple went two different directions from what they had been doing in the iMac’s. The 21.5” models went with the smaller laptop 2.5” HDD’s while the 27” models continued with the bigger 3.5” HDD’s.

To add to it Apple leverages the HDD thermal sensor as one of the inputs to the systems SMC services. Apple did their own thing working with the drive makers they where using getting them to customize the drives so the sensor could be accessed the way they wanted to. So you need to use the Apple OEM drives or offer your system a thermal sensor to satisfy your systems SMC with the needed input (27” models).

21.5” iMac’s 2.5” drives are a special case! As Apple altered the SMART output the drives they where using. The issue here is the SMART required an IRQ to read the thermal value (which slows the drive when it was used). As Apple wanted to access the value much more frequently than what the IEEE/EIA standard group had envisioned would be done. Apple again did their own thing forcing the HDD makers to customize the drives SMART firmware to Apples specs. Apple did propose the change to the IEEE/EIA standards body and while it took awhile the current crop of 2.5” drives (HDD & SSD) offer the needed alteration. Apple also updated the 27” iMac’s firmware to also use the newer SMART services in the 2014 systems onward after getting the newer firmware within the newer macOS releases. So they no longer need the inline thermal sensor as long as the drive offers the newer SMART services.

So the bottomline here is what is your macOS release as well as the drive you are installing?

You likely don’t need to worry about any of this!

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The hard drive that was installed is the Crucial MX500 1TB 3D NAND SATA 2.5 Inch Internal SSD, up to 560MB/s - CT1000MX500SSD1. The OS is the most current version of Big Sur. The fan, however, is on max when booted up. I assume that the issue is the HD?


@dmenkel - When did you get the drive and where?

Did you check its firmware release? Crucial MX500 firmware updates And you might want to check its SMART services? How to Check SMART Status of your Mac drives as well as get the details of what SMART is reporting How do I get detailed SMART disk information in macOS.

I forgot one tool which is easier to read DriveDX


Thank you, that was nice to know. I checked the drive and it does not support SMART. Based on Crucial's website it looks like the have an app, but it is only for Windows. Does anyone have a list of SMART enabled SSD drives?


@dmenkel - Sorry no magic list too many SSD makers/resellers to create a list

I would just go with a Samsung 870 EVO SSD drive


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