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$70.99 off *NOW* Get Parallels Desktop Pro Edition - Windows/Multi OS Compatibility software for Mac - Only $29.00 with select OWC SSDs, HDDs, Memory, External Storage, and Optical Drives! (Limit 3 rebates, 1 rebate per qualifying item)
Must purchase with: PPDPROSUB1Y-REB29

DIY Bundle

4.0TB HDD Upgrade Kit
For All 2012 and later 21.5" iMac models

Complete Kit including Tools
and 4.0TB Toshiba Laptop Series HDD
Upgrade with Confidence!
Improve Performance and Capacity
OWC's solution is the only on the market allowing a third-party SATA drive to be installed in your iMac. Everything you need to install a high capacity HDD in a 21.5" 2012 or later iMac.
SoftRAID Pre-Certified
For your convenience, the included drive has been SoftRAID pre-certified and formatted for use with the Mac OS.

4.0TB Toshiba Laptop Hard Disk Drive Specifications:


Form Factor
2.5″ 15mm HDD
SATA 6.0Gb/s
Formatted Capacity
Rotational Speed
5,400 RPM
Cache / Data Buffer
Manufacturer Model Number
RoHS Compliant


Idle Mode, Active, Max
70 Watts


Height (max)
1.5 cm (0.6 in)
Width (max)
7.0 cm (2.7 in)
Length (max)
10.0 cm (3.9 in)
Weight (typical)
180.0 g (0.40 lbs)
Bytes per Sector
512 / 4k (512e)

Environmental (Operating)

-304.8 m to 3,048 m (-1,000 ft to 10,000+ ft)

Environmental (Non-Operating)

-304.8 m to 12,192 m (-1000 ft to 40,000+ ft)
  • 1GB = 1,000,000,000 bytes. Total accessible capacity varies depending upon operating environment (typically 5-10% less). The actual total capacity will depend on your own defined file settings/preferences.
  • In terms of standard gigabytes, 1GiB ≈ 1.074GB and refers to the actual formatted capacity of shown under Mac OS 10.5 or earlier and Microsoft Windows OS.
  • Specific application environments such as temperature and duty cycle will affect the overall reliability rates.
Manufacturer provided specifications for Other World Computing p/n YIMAC212H4.0 UPC#: 810586030489

Install Video

This product is compatible with... Learn how to find your Mac's model ID
iMac Intel
iMac w/ Retina 4K display (21.5-inch Late 2015)
(October 2015)
Model ID:iMac16,2
3.1GHz i5, 3.3GHz i7
iMac Intel
iMac (21.5-inch Late 2015)
(October 2015)
Model ID:iMac16,1
1.6GHz i5, 2.8GHz i5
iMac Intel
iMac (21.5-inch Late 2015)
(October 2015)
Model ID: iMac16,1 or iMac16,2
1.6GHz i5, 2.8GHz i5, 3.1GHz i5, 3.3GHz i7
iMac Intel
iMac (21.5-inch Mid 2014)
(June 2014)
Model ID: iMac14,4
1.4GHz i5
iMac Intel
iMac (21.5-inch Late 2013)
(September 2013)
Model ID: iMac14,3
2.9GHz i5 or 3.1GHz i7
iMac Intel
iMac (21.5-inch Late 2013)
(September 2013)
Model ID: iMac14,1
2.7GHz i5
iMac Intel
iMac (21.5-inch Early 2013)
(March 2013)
Model ID: iMac13,1
3.3GHz i3
iMac Intel
iMac (21.5-inch Late 2012)
(October 2012)
Model ID: iMac13,1
2.7GHz i5 , 2.9GHz i5, 3.1GHz i7


  • (1) High-capacity HDD
  • (2) OWC 2-1/4" Suction Cup
  • (1) Torx T10 driver
  • (1) OWC Screen Removal Tool
  • (1) Nylon Pry Tool (Spudger)
  • (1) 21.5" iMac Adhesive tape set for proper display resealing
  • (1) OWC Blue Microfiber Screen Cleaning Cloth

NOTE: This kit contains consumable and/or one time use components and therefore is non-refundable if opened. If you have any concerns about your ability to perform the upgrade, you can return the unopened kit for a refund.


The best warranty is one you never have to use - but should the need occur - we're proud to provide a superior level of support and service coverage to our customers.

2 Year OWC Solution Limited Warranty

OWC is proud to provide a superior level of support and warranty coverage to our customers. Even when not used, we understand the peace of mind afforded by a longer warranty period. OWC's industry leading coverage is a testament to our confidence in the reliability of the solutions that we offer. OWC solutions are engineered to demanding quality standards in order to deliver the most reliable, highest performance available on the market in each storage category.
DIY Bundle 4.0TB HDD Upgrade Kit For All 2012 and later 21.5" iMac models Mfr P/N: YIMAC212H4.0 OWC SKU: OWCYIMAC212H4.0 Complete DIY kit for upgrading the hard drive in your 2012 and later 21.5" iMac 2 Year OWC Limited Warranty Ships: Same Day Only $216.85Bundle Priced for $149.99
Add to CartOther World Computing YIMAC212H4.0 In Stock, Click to Buy Now
Additional Configurations: Complete Kit w/ HDD
  • 1.0TB
    • Ships: Same Day
    • Only $119.99
    • Bundle Priced for $83.75
  • 2.0TB
    • Ships: Same Day
    • Only $149.99
    • Bundle Priced for $81.64
  • 4.0TB