Hello, My mid 2011 21,5" iMac HDD has failed. The computer still runs but everything runs extremely slow at times, freezes, taking forever to boot, lagging... and all this without any load on either CPU or RAM at all... The S.M.A.R.T status is failed and i suppose that's it. I shouldn't even bother reinstalling OS X right? A failed SMART status means a bad disk, no? (sometimes the smart status switches back to confirmed but always comes back and views failed, so i guess it's in its early stages of.. well.. death.) I though about maybe getting some sort of software to check for bad blocks but then SMART probably analyzes more than bad blocks, what you say? Then to my main question, I will most certainly replace the drive if nothing else comes up and I'm pretty sure i know how to do it. The only thing im wondering is if I need to get a specific type of HDD, I read somewhere that the drive needs to be of the same brand (****ing useless seagate in my case) in order for sensors and **** to work? Also, how do I get OS X back on my mac. Is the recovery utility software built into some kind of BIOS so the options still pop up when booting with command+R even though there's an empty drive in it ? Thanks!