Samsung promises yet another fix for slowed 840 EVO SSDs

Months after releasing an initial fix, some users are seeing performance of their Samsung 840 EVO SSDs slow down yet again.

Samsung's 840 EVO SSDs were among the cream of the solid-state crop in 2013, boasting fast speeds and big-time storage capabilities at a (then) record low cost. But some buyers noticed a troubling occurrence: As time went on the drive's read performance could plummet, all the way down to sub-100MB per second speeds. That's a mammoth dip from the drive's claimed 520MBps maximum.

Fortunately, Samsung was able to identify the root cause of the problem--a combination of usual NAND cell degradation and an unusual NAND management issue--and issued a fix in Ocotber. Problem solved!

Not so fast. Some (but not all) previously affected users have reported seeing performance dip yet again after using Samsung's original patch. PC Perspective's Allyn Malventano rounded up numerous 840 EVO SSDs and found several drives with the issue, one of which he sent to Samsung for evaluation. Now, Samsung's released a statement to PC Perspective and AnandTech acknowledging that slowdown is still a problem for a small subset of 840 EVO users:

"In October, Samsung released a tool to address a slowdown in 840 EVO Sequential Read speeds reported by a small number of users after not using their drive for an extended period of time. This tool effectively and immediately returned the drive's performance to normal levels. We understand that some users are experiencing the slowdown again. While we continue to look into the issue, Samsung will release an updated version of the Samsung SSD Magician software in March that will include a performance restoration tool."

In other words, the initial fix isn't as much as a fix as it was originally thought. Samsung's still researching a more permanent solution, but releasing an update to (presumably, hopefully) refresh the "stale" data on affected SSDs in the meantime. It's better than nothing, I guess, but here's hoping Samsung solves this puzzle sooner rather than later.

One upside: These performance issues have been isolated to the Samsung 840 EVO alone. The newer Samsung 850 Pro and 850 EVO SSDs, which use bleeding-edge vertical NAND technology, aren't affected. No matter what type of solid-state drive you use, PCWorld's ultimate guide to SSD management can help you keep it running faster, longer.

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.

Tags storageSSDsamsungDrivessolid state drive

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.
Brad Chacos

Brad Chacos

PC World (US online)
Show Comments

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Tom Pope

Dynabook Portégé X30L-G

Ultimately this laptop has achieved everything I would hope for in a laptop for work, while fitting that into a form factor and weight that is remarkable.

Tom Sellers

MSI P65

This smart laptop was enjoyable to use and great to work on – creating content was super simple.

Lolita Wang

MSI GT76

It really doesn’t get more “gaming laptop” than this.

Jack Jeffries

MSI GS75

As the Maserati or BMW of laptops, it would fit perfectly in the hands of a professional needing firepower under the hood, sophistication and class on the surface, and gaming prowess (sports mode if you will) in between.

Taylor Carr

MSI PS63

The MSI PS63 is an amazing laptop and I would definitely consider buying one in the future.

Christopher Low

Brother RJ-4230B

This small mobile printer is exactly what I need for invoicing and other jobs such as sending fellow tradesman details or step-by-step instructions that I can easily print off from my phone or the Web.

Featured Content

Product Launch Showcase

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?