Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7

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Replacing iMac failing hard drive.

iMac Intel mid 2010 27" Core i5 2.8GHz EMC 2390

I am going to be buying a new drive, the old one in my Mac seems to be Seagate Barracuda based on the model number found in the system report (ST31000528AS) and put into Google. (I hope so, seeing as the only way to be sure is to open the Mac and see. Let me know if this is necessary.)

So what I have read, I need to buy the same brand drive, so I plan to get a 2TB Seagate drive through iFixit. But i also wanted to purchase the OWC thermal sensor cable to I don't have any fan problems. On the OWC website they give the Mac specs it will be compatibly with but not the drives it will work it.

Will that OWC cable fit into a Seagate drive? Or do I have to buy a OWC drive for the cable to work? (Which I'd rather not do, it seems their drives are for PCs.)

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OK lets start this by reviewing what the steps are to replace your current drive. Here's the IFIXIT guide for your system: iMac Intel 27" EMC 2390 Hard Drive Replacement.

You'll note the needed cables are all present here. You don't need any SATA or power cables.

In Step 10 we do have a special thermal sensor cable that is customized for each of the suppliers Apple used for HD's. OK, as you are planning on swapping out the HD with another Seagate drive you don't need to worry about the cable other than note how its plugged in as it can be put in a few different ways! I always take a picture of the connection before I pull the cable so I have a record how it was installed before I pull it off.

Whats also important here is the HD you do go with needs to be able to run at SATA II (3.0 Gb/s). Make sure it can. Thats all there is to it!

But, lets talk a bit about SSHD's which is what I would put in vs a standard HD. It will give you a bit more zip! Seagate makes a nice one, here's the info: Seagate desktop SSHD.

OK, we've talked a lot about the hardware side of things here but before you do this you will want to prep up your new HD with the OS before hand.

If your system is still working with your current HD you should get an external Firewire HD case or USB to SATA adapter cable so you can connect your new drive up externally. That way we can format and install the OS using your current systems OS. You may also want to transfer your apps & files over using a cloning app.

If your HD is dead, you'll need to find the recovery CD/DVD disk that came with your system or create from a friends system a bootable HD or USB thumb drive to run your system or use the method above from your friends system.

The last thing here is you may want to boost your RAM if you are planning on running Yosemite. 4GB is on the lower end of RAM we have found older systems run better with 8GB or more.

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I am already running my Mac with 8GB RAM. And currently, my HDD on my Mac is dead, won't boot. So I downloaded Yosemite on an external drive and booting from that. All my backup files are on another external drive.

I have looked into getting a SSD but those are the ones people seem to have fan problems with too (even if they plug in the correct orientation), or their SATA cables from their mac won't fit. So I am a little wary of getting one. And the price is a little higher.

Thanks for letting me know I need a drive that is a SATA II (3.0 GB/s) - I have no idea what that means but is that still what you would tell me even though you now know I run 8GB RAM? Is the seagate one here compatible? 2 TB 3.5" Hard Drive

And one more question - I only think a seagate is currently in my mac because when I do system report/hardware/SATA/SATA Express/Intel 5 Series Chipset/ST31000528AS - i put that serial # in google and it shows a lot of seagate barac. results.

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A SSHD is not a SSD its a hybrid drive a HD with a SSD acting as a deep cache. Click on the link I posted to get a better idea on what it is. You're right a SSD would need an adapter frame as its a 2.5" device Vs your HD which is a 3.5" (the SSHD is 3.5"). Using the 3.5" Seagate HD or SSHD does not require any different cables. So you'll be fine here which ever way you go. The only issue is the thermal sensor cable being plugged in correctly.

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