Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7, ID iMac11,3

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Switching to a Hybrid-Reuse original thermal sensor?

I need to replace my 1TB hard drive and have decided on the Seagate 4TB Hybrid. Will I need to order a new thermal sensor or can I use the one off the drive I'm pulling out? Will I also need to order an adapter cable as well?

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This series used the internal thermal sensor within the drive. Apple had three different cables to match up with the different vendors drives they used. To make this simpler I would just order this: OWC In-line Digital Thermal Sensor for iMac 2009-2010 Hard Drive Upgrade it will allow you to use any drive you choose.

As to the drive: You've picked the best one for the upgrade! This system has a SATA II (3.0 Gb/s) drive interface so you do need to be careful you get a drive which is compatible (no problem here with the Seagate SSHD drive).

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Will the thermal sensor give instructions on where to place it on the new drive? I'm thinking of pulling the original ram and replacing with 4x4GB cards and seems easy but is there anything I should consider? Will I expect to see a big difference? Thanks for this great site!!


Yes, the instruction sheet that comes with the sensor explains were you need to put it.

As for the upgrading of your RAM: pushing your system to 12 - 16 GB (the max for your system is 32 GB)! It will make a big difference if you do a lot of image or video editing as well as gaming. You should make sure your systems firmware is up to date. Follow this Apple T/N: About EFI and SMC firmware updates for Intel-based Mac computers make sure yours is at or newer than the level listed.


I was able to swap my bad HD with the new Seagate Hybrid and also installed my 16 GB which is the max for my 11.2. I knew the next step would be software and not a hardware activity. Powered up the iMac and loaded my OS X installation disc and am now getting the screen that is asking "Select the disk where you want to install Mac OS X". I've tried reading your other threads to try to resolve this on my own and went into Utilities-Disk Utility then selected my new 4TB ST4000DX001-1CE HD. I went ahead and selected the Erase tab which then gave me the option to install the MAC OS X on my new untitled drive. I received a message that it would take approx 25 minutes to install but after a few minutes I received an error message which required me to restart. I'm doing that now and will check the status in the morning. Have I followed the proper steps so far?


Update-Rebooted and the OS X downloaded completely and then began to move all of my files from my external back-up drive and finished this morning. Everything looks correct but my new HD is a carbon copy of my external HD. Should I now run a Time Machine restore and use the last version before my original HD died? I went ahead and updated my software to version 10.6.8. If I restore my system using the Time Machine, will I need to update the software again? The only reason why I want to do a restore is that I had some folders on my original HD that I may not have replicated on my external drive. Sorry for the basic questions.


Did you first format the drive GIUD and Mac OS X extended. You have to do that before installing the system. Also, you may not need the OWC sensor if the drive you pulled was a Seagate.


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