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<blockquote data-quote="harryb2448" data-source="post: 1748819" data-attributes="member: 42497">Bob I have researched this further with OWC and can advise just go ahead, no heat sensor.&nbsp; This reply came back from OWC Rebecca concerning the 2012 21.5&quot; iMac:-Dear Harry,Thank you for contacting OWC customer support. Imacs since late-2009 have had proprietary thermal sensors in the HDD bays. The factory cabling only works with the factory drive so you must modify the cabling if you change out the drive. However this issue ONLY exists in 3.5&quot; bays (not 2.5&quot;). This means the HDD bay of your iMac, which is 2.5&quot;, does not have such an issue. For the HDD bay you do not need the OWC thermal sensor cable which is why our HDD upgrade kits for your model do not include a thermal sensor. If you have any questions feel free to contact me again. Thank you and have a great day!Sincerely,Rebecca RCustomer Experience RepresentativeMacsales.</blockquote>

[QUOTE="harryb2448, post: 1748819, member: 42497"] Bob I have researched this further with OWC and can advise just go ahead, no heat sensor. This reply came back from OWC Rebecca concerning the 2012 21.5" iMac:- Dear Harry, Thank you for contacting OWC customer support. Imacs since late-2009 have had proprietary thermal sensors in the HDD bays. The factory cabling only works with the factory drive so you must modify the cabling if you change out the drive. However this issue ONLY exists in 3.5" bays (not 2.5"). This means the HDD bay of your iMac, which is 2.5", does not have such an issue. For the HDD bay you do not need the OWC thermal sensor cable which is why our HDD upgrade kits for your model do not include a thermal sensor. If you have any questions feel free to contact me again. Thank you and have a great day! Sincerely, Rebecca R Customer Experience Representative Macsales. [/QUOTE]

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