The HDD in one of my iMacs is dying... the number of re-allocated sectors is growing at a depressing (though not yet alarming) rate
It's waaay out of warranty, not under AppleCare, and not my main machine, but it's too useful to ditch and I don't fancy paying Apple prices for an HDD swap. I've looked at a few videos on the 'net and I'm perfectly happy that it's well within my capabilities.
But I know zilch about SATA drives... the one in there is a 3.5" Seagate Barracuda, 1TB, 7200.12, model ST31000528AS, but I know Apple also use WD drives.
Can I replace it with any SATA drive that will physically fit, or is there anything in particular I should look for?