HT3559 what is the format of a 500gb drive inside an imac?

I need help to replace an HDD of a 21.5 mid 2010 iMac with something faster (I'm thinking about a Seagate 750GB SSHD hybrid drive) and for that I need to know what is the physical size (2,5" or 3,5" or the actual measurement of the drive's dimensions) of the HDD (500GB SATA) built in. The idea is to have prepared a new drive so that the replacement goes smoothly.

Just google the drive in question (or go directly to the Seagate site) + "form factor." The orginal drive will be 3.5" and have a standard size.
I don't know what will happen with a hybrid, but you might want to know before plungng ahead that all the drives for that model are Apple proprietary, with special firmware for the reading of the internal temp sensor.
The usual result of replacing the drive is that the SMC (System Management) receives no input for the temp of the drive and revs the drive fan up to max. One workaround for this, at least with ordinary drives, is to get the free SSD Fan Control.
http://exirion.net/ssdfanctrl/

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