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My Mid 2010 i3 3.2GB 21.5" iMac has a 1TB Seagate ST31000528AS. I have to replace HDD’s with the same manufacturer for the thermal sensor, right? Where can I find a Seagate 2TB HDD that I can swap out with the original? Thanks in advance.

Yes you are correct this does need same manufacturer. I believe also it must be of the same series, which means you are going to want to find a drive to the tune of ST32######AS. I saw a few for reasonable prices on Newegg. I believe this is what you are looking for.

Thank you for the reply, that explains what I need to know. Nothing wrong with the current HDD, just need more space. I’ll pop over to Newegg and check it out. +