OWC Announces Hard Drive SMC Compatibility Kit for all Apple iMacs 2009 and Newer Now Supports Capacities Up to 8TB

Apple iMac owners can now upgrade their storage capacity to 8TB, maintaining proper system fan control and full Apple Diagnostics compatibility

Jun 22, 2015 | Woodstock, IL


Other World Computing (OWC®), a leading zero emissions Mac and PC technology company, announced today that the OWC Hard Drive DIY Kit for iMac now enables iMac owners to replace the factory-installed hard drive with a new hard drive up to 8TB, all while maintaining proper system fan control and native compatibility with Apple Diagnostics.

Key Features:

  • Eliminates excessive fan noise and maintains correct system fan control when upgrading the storage of a 2009 or newer iMac
  • Engineered to work natively with Apple Diagnostics
  • Eliminates thermal compatibility issues with third party drives; Use virtually any SATA drive!
  • Ideal for iMac owners and service providers
  • OWC Install Videos guide you every step of the way
  • Backed by OWC's award-winning customer support

The Problem: Custom Drive Firmware
With the introduction of the iMac, Apple's factory-installed drives contained custom firmware that communicated thermal data to the System Management Controller (SMC). Off-the-shelf hard drives do not include the custom firmware, and as a result, SMC is unable to monitor the temperature of the hard drive and the iMac fans will run at full speed and fail Apple diagnostics as a failsafe.

Despite various 'hacks', the best solution is to still use Apple's SMC to ensure proper monitoring of drive and system health.

The Proven Solution: OWC Hard Drive DIY Kit
With easy step-by-step videos and installation tools, the OWC Hard Drive DIY Kit includes a custom-designed digital thermal sensor that connects virtually any 3.5" SATA drive to the iMac. The thermal module communicates drive temperature data to the SMC, enabling proper system fan control.

This innovative plug-and-play device requires no software hacks and is also fully compatible with Apple diagnostic testing, allowing all 2009 and newer iMac owners to retain proper cooling and pass the Apple Hardware Test when installing a replacement drive.

"The Hard Drive DIY Kits for 2009 and newer iMacs represent our commitment to DIY enthusiasts and upgraders," said Larry O'Connor, Founder and CEO, OWC. "It's an unfortunate fact that all hard drives will eventually fail, but this innovative kit from OWC represents the best complete, proven solution for replacing and upgrading with more capacity while retaining proper system operation."


  • OWC In-Line Digital Thermal Sensor Cable and Fan Control assembly for iMac
  • NewerTech 14-piece Toolkit
  • OWC Microfiber Cloth
  • 2 NewerTech Suction Cups
  • Quick Start Guide


  • iMac 2009 - 2010 (21.5" & 27")
  • iMac 2011 (21.5" & 27")
  • iMac 2012 - Present (27")

Pricing and Availability:

OWC's In-Line Digital Thermal Sensor HDD DIY Kit is available for immediate ordering.

iMac 2009 - 2010 $57.00 iMac 2011 $57.00 iMac 2012 - present (including Retina 5K) $59.00

Bringing it to a professional installer or already have your own tools? All kits are also available without installation tools for $39.75.

The OWC Trust Advantage®

  • Over 25 years of product design and innovation
  • OWC tested for compatibility, speed and reliability
  • Comprehensive step-by-step installation and support videos
  • 24/7 award-winning, U.S.-based customer support

About OWC

Other World Computing (OWC), founded in 1988, is dedicated to helping Mac and PC enthusiasts do more and reach higher. We believe in sustainability – OWC solutions are genuinely built to last, go the distance, and enable users to maximize the technology investment they have already made. OWC's operation provides leadership in business sustainability, with its headquarters among the first in the world awarded LEED Platinum certification. OWC features an award-winning technical support team and an unparalleled library of step-by-step DIY and informational videos. From the home desktop to the enterprise rack, the corporate backup to secure medical data, the recording studio to the motion picture set, and beyond, there should be no compromise. That is why OWC is here.

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Company Contact

Nathan Papadopulos