SK Hynix​ Gold S31 SSD REVIEW | Mac Sources

4 min readOct 4, 2019


SK Hynix​ Gold S31 SSD


SSD sets a dynamic new standard with top-tier speed and proven quality.

For years, I’ve stuck to a specific brand when looking for hard drives to supplement my offline storage options. I like to make sure that I’m getting a quality product and with so many knock-off brands online, I really try to stick with ones I know like Toshiba, Western Digital, and Seagate. That said, sometimes it pays to go with a brand that you are less familiar with. SK Hynix is a manufacturer out of South Korea that has had a relatively small footprint in the hard drive market. Some of the memory in Apple computers is supplied by Hynix and so when I was approached to review the Gold S31 SSD from SK Hynix, I took a chance.


The SK Hynix Gold S31 SSD puts “superior performance at the core of your PC upgrade.” It provides read speeds up to 560 Mb/s and write speeds up to 525 Mb/s. The hard drive is powered by an in-house 3D NAND, controller, and DRAM. It’s been tested and proven reliable and stable with 1.5 million hours MTBF and best-in-class 600 terabytes written. The hard drive comes in three different sizes with 1TB capacity being the largest. It retails for approximately $119 (at the time publishing). All three sizes come with a five-year warranty.


  • Ideal for: Gamers/Creators
  • Capacity: 1TB/500GB/250GB
  • Interface: SATA III 6Gb/s
  • Form Factor: 2.5-inch
  • Sequential Read Speed: Up to 560 Mb/s
  • Sequential Write Speed: Up to 525 Mb/s
  • TBW (Terabytes Written) Up to 600TBW (1TB)
  • Controller: SK Hynix Controller
  • Item Dimensions: 3.94 x 2.75 x 0.28 inches
  • Weight: 2.15 ounces


The S31 SSD comes in a rather striking black box with the SK Hynix branding printed on the front. The SSD comes packaged in an anti-static bag and is easily installed into an existing computer or hard drive enclosure that is compatible with SATA III. The case of the SSD is impressive. When I first took a look at it I actually thought that it could potentially stand — alone without an enclosure. The exterior is aluminum and the hard drive is well-protected from exterior elements.

For te sting purposes, I added it to an SSD RAID enclosure from Akitio. This allowed me to test the drive speed through a Thunderbolt 3 connection, which is up to 40GB/s. Because I was using this drive with a Mac, I first had to format that hard drive so that it could be read by my computer. Using Disk Utility, I erased the drive and formatted it as Mac OS Extended (Journaled). After the formatting, the disk was showing 999.2 GB free.

The first application I used to test the S31 was Blackmagic’s Disk Speed Test. This measured the read/write speed of a targeted disk. In this case the disk was the S31 SSD. The result was 467.6 MB/s write and 514.1 MB/s read. These results were inline with the specs outlined by SK Hynix. The second test I ran was using AJA System Test Lite. This specifically tests disk read/write speeds in relation to video/media file handling. The first test I ran using this software was for processing 4K video. The results were 472 MB/s Write and 501 MB/s Read. Since this was very close to the results I received from the Blackmagic test, I ran one additional test which assumed the video processing file was a 1080P HD file. This slowed down the read/write speeds quite a bit (316/347 MB/s respectively).


SK Hynix has a really nice product with the S31 Gold SSD. It’s providing solid performance and the results I got from my individual testing was completely in line with the specs for the SSD. With a lower-end price point ($119 at the time of writing this article), I think it’s a clear candidate for someone looking to boost their performance with an SSD.

For more information, visit and Facebook.

Originally published at on October 4, 2019.




Mac Sources is an Information and Technology Company. We review all things technology-related. Our team also reports on tech news happening in the world. 