250GB OWC 3G SSD
and Data Doubler for 2009 - 2011 21.5" iMacs
Mercury SSD and Optical Bay Mounting Solution
Upgrade with Confidence!
The complete solution for your 2009 - 2011 21.5" iMac
Configuration flexibility is yours when you replace your iMac's internal SuperDrive with an OWC SSD using the Data Doubler. Boost your storage capacity by adding additional storage, and enjoy near-instantaneous boot and app loading times thanks the performance of an OWC 3G SSD.
Fast and reliable solid-state storage
Delivering the latest in flash NAND and controller technology, utilizing SLC and 3D NAND for long-lasting, power-efficient performance. Mercury Electra 3G SSD's offer a powerful combination of performance and reliability for demanding everyday computer users.
Upgrade Your iMac with Confidence.
OWC's custom-engineered Data Doubler bracket comes ready to mount any 2.5" SATA drive up to 12.5mm in height. Data Doubler also comes backed by OWC's award-winning U.S.A. based technical support team which is readily available to assist you with your upgrade should you have any questions.
250GB Mercury Electra 3G SSD Specifications:
Silicon Motion SM2259XT with 3% over-provisioning
NAND Flash Components
Synchronous Triple-Level Cell (TLC) 3D NAND Flash
Standard 7mm 2.5"
SATA 3.0 Gb/s
250GB Useable Capacity
Total Flash Memory Components: 256GB
6GB Allocated to real-time data redundancy and error correction
Native Command Queuing
Up to 32 simultaneous commands
7 mm (0.276 in)
70.06 mm (2.758 in)
100.12 mm (3.941 in)
60.0 g (0.13 lbs)
MTBF (Mean Time Between Failures)
ATA Security Feature Command Set and Password Login Support
Nonrecoverable Read Errors
Less than 1 sector per 1015 bits read
Mac OS Compatibility
PC OS Compatibility
Requires a Mac, PC, or drive enclosure with an available SATA drive bay. SATA II (3.0 Gb/s) or faster required for best performance.
Average Access Time
Sequential Read (Max)
Sequential Write (Max)
Idle Mode (Max)
1500 G max at 0.5 ms
32°F to 158°F
0°C to 70°C
5% to 95% non-condensing
1500 G max at 0.5 ms
-40°F to 185°F
-40°C to 85°C
Data Doubler Specifications:
- Fully SATA Revision 3.0 (6Gb/s) compatible
- SATA Revision 2.0 (3Gb/s) and 1.0 (1.5Gb/s) compatible
- (1) 2.5" SATA 6Gb/s drive
Manufacturer provided specifications for Other World Computing p/n K21IM09OE250
- Height: 0.5 in (1.2 cm)
- Width: 4.0 in (10.2 cm)
- Length: 5.0 in (12.7 cm)
Weight (Without Drives
Data Doubler Install Video
21.5" iMac (2011) Install Video
21.5" iMac (2010) Install Video
21.5" iMac (2009) Install Video
iMac (21.5-inch Mid 2011)
Model ID: iMac12,1
2.5GHz i5 , 2.7GHz i5, 2.8GHz i7
iMac (21.5-inch Mid 2010)
Model ID: iMac11,2
3.06GHz i3, 3.2GHz i3, 3.6GHz i5
iMac (21.5-inch Late 2009)
Model ID: iMac10,1
- (1) OWC Mercury 3G SSD
- (1) OWC Data Doubler Optical Bay Mounting Solution
- (2) OWC 2-1/4" Suction Cup
- (1) Torx T10 driver
- (1) Torx T8 driver
- (1) Torx T6 driver
- (1) Phillips #00 Driver
- (1) Nylon Pry Tool (Spudger)
- (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.
3 Year OWC SSD Limited Warranty
on the OWC Mercury Electra 6G SSD
1 Year OWC Brand Standard Limited Warranty
on the OWC Data Doubler
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.