250GB OWC Mercury Electra 6G
DIY SSD Bay Add-In Kit for 21.5-inch iMac (2011)
Mfr P/N: K21IM11SE250 OWC SKU: OWCK21IM11SE250
$90.99 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: Parallels Desktop Pro Edition for Mac - 1 Year License. SPECIAL PURCHASE
Complete DIY kit for adding an SSD to the internal SSD bay of your 21.5-inch iMac (2011)
- Brings 6G speed and performance to your system
- Easily expands your internal storage
- Included durable toolkit makes installation easy
- No drivers or extra software required for operation
- 3 Year OWC Limited Warranty
The complete solution for your 2011 iMac
Fast and reliable solid-state storage
We are here to help
- Please note, that before attempting to perform this installation, it is recommended you watch the associated 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.
Includes
- (1) OWC Mercury Electra 6G Solid-State Drive
- (1) SATA 6GB/s Data Cable
- (1) iMac SATA Power Cable
- (2) 2.25-inch Suction Cup
- (1) Torx T10s Driver
- (1) Torx T6s Driver
- (1) Phillips PH2 Driver
- (1) Nylon Pry Tool
- (1) Adhesive Strip Set
- (1) OWC Blue Microfiber Screen Cleaning Cloth
- 3 Year OWC Limited Warranty
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.
Specs
250GB OWC Mercury Electra 6G 2.5-inch 7mm SATA 6.0Gb/s Solid-State Drive
- Use of a 2.5-inch SSD in a 3.5-inch drive bay requires an adapter bracket such as the NewerTech AdaptaDrive.
- Use of any SSD in an external enclosure is dependent on the power available from the enclosure. OWC Mercury Electra 6G and Mercury Extreme Pro 6G SSDs are engineered for use in any OWC Enclosure that supports 2.5-inch SSDs.
Total Capacity
- 250GB Useable Capacity
- Total Capacity: 256GB
- 6GB Allocated to real-time data redundancy and error correction
Formatted Capacity
- 233GiB
Drive Format
- Unformatted (Instructions on formatting here)
S.M.A.R.T. Attributes
- Standard attributes supported
Native Command Queuing (NCQ)
- Up to 32 simultaneous commands
RAID Support
- Yes
Form Factor
- 2.5-inch 7mm
Drive Interface
- SATA 6.0 Gb/s
Random 4K Read
- Up to 54,000 IOPS
Random 4K Write
- Up to 81,000 IOPS
Sequential Read (Max)
- Up to 535 MB/s
Sequential Write (Max)
- Up to 465 MB/s
Nonrecoverable Read Errors
- 1 per 1015 bits read
MTBF (Mean Time Between Failures)
- 1,500,000 hours
Wear Leveling
- Supported
TRIM Support
- OS Dependent
Error Correction
- Built-in ECC
Security
- ATA Security Feature Command Set And Password Login Support
Mac OS Compatibility
- Yes
PC OS Compatibility
- Yes
Other Requirements
- Requires a Mac, PC, or drive enclosure with an available SATA drive bay. SATA III (6.0 Gb/s) required for best performance.
Idle Mode (Max)
- Up to 0.1 Watts
Dimensions
- Height: 0.7 cm (0.3 in)
- Length: 10.0 cm (4.0 in)
- Width: 7.0 cm (2.7 in)
Weight
- 60.0 g (0.13 lbs)
RoHS Compliant
- Yes
Reach Certification
- Yes
Ambient Temperature
- Operating: 32°F to 158°F (0°C to 70°C)
- Non-Operating: -40°F to 185°F (-40°C to 85°C)
Altitude
- Operating: -304.8 m to 3,048.0 m (-1,000 ft to 10,000 ft)
- Non-Operating: -304.8 m to 12,192.0 m (-1,000 ft to 40,000 ft)
Humidity
- Operating: 5% to 95% non-condensing
Shock
- Operating: 1500 G max at 0.5 ms
- Non-Operating: 1500 G max at 0.5 ms
Idle (Typical)
- 0.0 bels
Seek (Typical)
- 0.0 bels
Applications
- All-purpose SSD
Compatibility & Installation Videos


Videos
Customer Reviews
A very good kit with one silly issue - please change the double-sided pads for mounting the SSD in the optical bay. It's close to impossible to get the cover plastic off without destroying the pads, I just gave up and bought some from the hardware store.
I would recommend this product to a friend!
- Reviewer:CleanSnake-8165
A very good kit with one silly issue - please change the double-sided pads for mounting the SSD in the optical bay. It's close to impossible to get the cover plastic off without destroying the pads, I just gave up and bought some from the hardware store.
I would recommend this product to a friend!
- Reviewer:CleanSnake-8165
I purchased this SSD way back in January 2017, and 5 years later it is still being used everyday and hasn't missed a beat. I am DELIGHTED with it. Before I put it into my Mid-2011 iMac my computer was soooooo sloooooow. I wanted to throw it out the window. I had previously upgraded the RAM to 12 GB (from 4 GB) and still it was sluggish. But once I switched the Operating System on to the OWC Mercury Electra 6G SSD, it ran so fast! Boot up took less than 20 seconds. It enabled me to get many, many more years of use from my iMac, and now more than a decade later (since the original iMac's manufacture) I'm still using this computer every day. It wouldn't have been possible without the SSD making the system fast and responsive. I HIGHLY recommend this drive from OWC. However, the installation is tricky. It helps if you have another person to hold stuff for you. I did it solo, and it took me 4 hours plus! (I was being ultra-careful, and documenting it as I went.) Allow heaps of time for the install and don't rush it. But it is an upgrade that is well worth it. It really does breathe new life into an old machine. My 2011 iMac is faster and more responsive than my friends 2019 iMac - because he didn't put an SSD into it.
I would recommend this product to a friend!
- Reviewer:Dub
Thank you so much Dub for taking the time to leave your review. We love to hear that your iMac is still running strong with that SSD upgrade you did with our OWC SSD. Please feel free to contact us if you have any further questions, comments, or concerns. Phone 1-800-275-4576 or +1-815-338-8685 Customer Service/Sales & Technical Support - Monday-Friday (8am-8pm CT) - Saturday & Sunday (Closed) Live Chat Technical Support - Monday-Friday (8am-8pm CT) - Saturday (9am-5pm CT) - Sunday (Closed) Live Chat Customer Service/Sales - Monday-Friday (7am-10pm CT) - Saturday & Sunday (9am-5pm CT). Thanks for choosing OWC, and have a great Day!