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We recommend OWC In-line Digital Thermal Sensor for 27" & 21.5" iMac (2011) (Mfr P/N: DIDIMACHDD11) from Other World Computing for $37.75 as a suitable alternative.

OWC Internal HDD DIY Kit for All Apple 21.5" iMac 2011 Models
Custom iMac HDD power cable with in-line digital thermal sensor module

OWC Internal SSD DIY Kit
This kit includes the cable and mounting set only.
iMac, tools, suction cups & microfiber cloth not included.
Close to maxing out your 500GB to 1.0TB factory-installed hard drive? With the OWC Internal HDD DIY Kit you can replace your old hard drive on your own with up to a 4.0TB drive (sold separately) for up to 8x more storage and backup capacity! This kit does not include the tools required for performing this upgrade. If you need the full upgrade kit with tools, you can purchase this OWC Internal HDD DIY Kit. The kits are certified to successfully pass the Apple Hardware Test.

Before attempting to perform this installation, please watch the instructional video in its entirety to determine your ability to perform this complex procedure. OWC assumes no responsibility for damage that may occur during the install. Technical support for this DIY product consists only of the installation video.
Turnkey Upgrade Installation Program
While OWC encourages the DIY philosophy, this is a very difficult install that requires advanced skills. If, after watching the how-to video, you are not fully confident of your ability to add an SSD to your 2011 21-inch iMac, you can choose to have OWC "Do It For You" via our Turnkey Upgrade Installation Program.
Includes:
  • Custom iMac HDD power cable with an in-line digital thermal sensor module

Includes

  • Custom iMac HDD power cable with an in-line digital thermal sensor module

NOTE: This kit contains consumable and/or one time use components and therefore is not covered by any warranty. If you have any concerns about your ability to perform the upgrade, you can return the unopened kit for a refund.
This kit is compatible with... Learn how to find your Mac's model ID
iMac Intel
iMac (21.5-inch Mid 2011)
(May, 2011)
Model ID: iMac12,1
2.5GHz i5, 2.7GHz i5, 2.8GHz i7
OWC Internal HDD DIY Kit for 21.5" Apple iMac 2011 Models Mfr P/N: DIDIM21HDD11 OWC SKU: OWCDIDIM21HDD11 OWC DIY Kit for all Apple 21.5" iMac 2011 Models for replacing the main hard drive. Includes all cables necessary for installation. Hard drive and tools sold separately. 30 Day OWC Limited Warranty
Sold Out
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Upgrade your iMac 2011 model with a blazing fast 3G or 6G Solid State Drive
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