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500GB Solid-State Drive

Mac / PC
2.5" Serial-ATA
Speed Up Your Mac or PC
Introducing the OWC Neptune 6G SSD
Neptune 6G SSDs deliver the extra performance you need for your everyday computing tasks. Designed to bring new life to your Mac or PC, Neptune increases speed and capacity without breaking the bank. Built to the same exacting standards as all OWC SSDs, Neptune makes upgrading your computer an easy, smart decision. Get ready to love your computer again.
Life in the fast lane
From booting to browsing, launching apps and editing projects, upgrading your factory drive to a Neptune SSD puts your computer's performance back in the fast lane, with blazing fast internal speeds. Neptune SSDs are built with technologies that outperform your computer's spinning hard disk, but without a single moving part. It makes for internal storage that's not just faster, but far more rugged and reliable than your computer's hard drive today.
Ready, set, go
Upgrading your computer and migrating your data to a new Neptune SSD is easy. OWC gives you everything you need to make the upgrade a breeze, including step-by-step installation videos and a technical support team that is a live chat or call away to help if needed. Ready to make your computer feel like new? Upgrade with an OWC Neptune SSD.
Accelerate every task. Every time.
Neptune SSDs are engineered to perform your everyday computing tasks faster than you've ever experienced. Featuring top-tier TLC NAND flash with 6GB of super-fast cache, everything about your computer will feel faster.

But Neptune SSDs aren’t just built for speed. Sophisticated on-board technologies like advanced error-correction and intelligent recycling mean Neptune SSDs are ultra-reliable and won’t slow down over time. For an SSD that delivers the reliability and performance you demand - for every task, every time - Neptune is the perfect choice.
Quality matters
For over 25 years, OWC has delivered innovative, high-quality upgrade and connectivity solutions to improve the performance and extend the life of computers. Each Neptune SSD undergoes comprehensive testing for quality, and is backed by OWC's award-winning U.S.-based lifetime support.

Release Candidate (RC) firmware set

There are two kinds of firmware for SSDs Mass Production (MP) and Release Candidate (RC). Prior to an MP firmware release, there are beta firmware releases and an RC firmware release. Often, the RC is the same as the MP release, however there can be small changes and bug fixes made between the two. OWC has evaluated the RC for the 6Gb/s SandForce 2281 Processor and found it to be stable with no issues reported during our testing. However, as with any evolutionary product, issues may surface as different usages and configurations are employed and it is important to understand that there will be further updates and revisions.

Since no firmware update is currently offered for the OWC Mercury EXTREME Pro 6G SSD, no update page exists. To see the typical steps involved with a self performed field firmware update, please visit our 3Gb/s product update page at:

It is important to note that the current firmware update tool requires the use of Windows XP/Vista/7. OWC is currently working on a Mac OS based update tool, but we do not have an exact availability date.

500GB Mercury Neptune 6G SSD Specifications:


Silicon Motion SMI2258
Form Factor
Standard 7mm 2.5"
SATA 6Gb/s, SATA 3.0 Compliant
Formatted Capacity2
RAID Support
SMART Attributes
Standard attributes supported
Native Command Queuing
Up to 32 simultaneous commands
Manufacturer Model Number
RoHS Compliant


Height (max)
7mm (0.3")
Width (max)
70.06mm (2.8")
Length (max)
100mm (3.9")
77 grams +/- 2 grams
0.170 lbs +/- 2.71 oz


Chip Based Data Encryption: 256-bit AES-compliant
TRIM Support
OS Dependent


Sequential Read (Max)
Up to 494 MB/s
Sequential Write (Max)
Up to 390 MB/s


∼ .05 W

Environmental (Operating)

Temperature (°F)
32°F to 158°F
Temperature (°C)
0°C to 70°C

Environmental (Non-Operating)

Temperature (°F)
−40°F to 185°F
Temperature (°C)
−40°C to 85°C


Idle (Typical)
0.0 bels
Seek (Typical)
0.0 bels
  1. 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. 
  2. 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.
  3. Specific application environments such as temperature and duty cycle will affect the overall reliability.
Manufacturer provided specifications for Other World Computing p/n S3D7N500S


Customer Ratings

Write a Review 4.8 / 5 11 out of 11 (100%) reviewers would recommend this product
Verified Buyer Top 50 Contributor
Reviewer: StevenP Location: Tasmania, Australia Experience Level: Power User Owned Product: less than a month
Rating: 5/5 Pretty good for the price October 9, 2018 This is hardly a world beating SSD but that is by no means a criticism.

For the price, it has been an excellent addition in helping to restore a 13" 2010 MacBook Pro from being so slow to be unusable to a really good little laptop for someone wanting to browse the web, do some email, use Word, back up the photos on their iPhone and watch YouTube.

For the right use case, I can recommend this product.

I would recommend this item to a friend! Customer Videos:

Verified Buyer
Reviewer: williamG Location: texas Age: 55-65 Experience Level: Home User Owned Product: 1-3 months
Rating: 5/5 just get one September 25, 2018 just get one or ten I have 4 of these SSD Drives now and will get more when nedded.

I would recommend this item to a friend! This review is from 120GB OWC Neptune 6G 2.5-inch 7mm SATA 6.0Gb/s Solid-State Drive. Customer Videos:

Verified Buyer
Reviewer: WayneManor Location: Boston Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 Easy install. Speed increase even in an old Mac Tower August 29, 2018 I bought 2 250gb SSD's for 2 different old MacPro towers. It was a little tricky but not difficult to attach them to the drive sleds, but once attached, install takes about 2 minutes. The software install was a bit harder mainly due to my stupidity. On one machine I used restore from Recovery and then Migration Assistant. Very slow and NOT recommended. The other machine, I used Carbon Copy Cloner which is a wonderful piece of software. Basically 1 stop shopping. After the install, I rebooted into my SSD and some more stuff described next. The SSD was not big enough to handle my entire prior drive, so I did not transfer Downloads, Documents, Music and Movies. Then, when the new SSD was ready, I set up soft links to the files on my older drive. Everything works and I still have about 48gB left on my 250gb SSD,. Boot up time is way faster. I wish I could have afforded larger SSD's, but these are fine.

I would recommend this item to a friend! This review is from 250GB OWC Neptune 6G 2.5-inch 7mm SATA 6.0Gb/s Solid-State Drive. Customer Videos:

Verified Buyer
Reviewer: donuil Location: Busselton, Australia Age: 55-65 Experience Level: IT Professional Owned Product: over 6 months
Rating: 5/5 Solid performer August 19, 2018 This meets all my expectations and performs well. This my second, as I put my first in an iMac I happened to have apart for repairs.

I would recommend this item to a friend! Customer Videos:

Reviewer: AriLeers Location: Santiago, Chile Age: 25-34 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 Very easy to install, Works Great July 20, 2018 Works perfectly on my Mac Pro (2009/2.66 Quad core)

I would recommend this item to a friend! This review is from 500GB OWC Neptune 6G 2.5-inch 7mm SATA 6.0Gb/s Solid-State Drive (OEM 20 Pack). Customer Videos:

OWC Neptune 500GB Solid-State Drive Mfr P/N: S3D7N500S OWC SKU: OWCS3D7N500S Make everyday tasks from booting to launching apps faster with this entry-level OWC SSD. 3 Year OWC Limited Warranty Ships: Same Day only $99.97
Add to CartOther World Computing S3D7N500S In Stock, Click to Buy Now
Additional Capacities: Individual SSDs
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Pack of 20 SSDs
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