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Guru3D.com » News » Samsung investigating 840 EVO slowdowns

Samsung investigating 840 EVO slowdowns

by Hilbert Hagedoorn on: 02/23/2015 03:11 PM | source: | 34 comment(s)
Samsung investigating 840 EVO slowdowns

A couple of weeks ago we already reported that the Samsung 840 EVO SSDs are still experiencing slow read speeds with old data. basically TechReport placed a couple of SSDs on shelf, didn't use them. Then after three months they connected them again and boom, slow performance of the old data written.

The issue was supposedly fixed with a firmware update (EXT0CB6Q-firmware) issued in October, but some patched drives continue to exhibit the problem, including one of our own. Late Friday afternoon, Samsung issued the following statement on the matter:

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.

If you look at the screenshot above you can see the performance degraded. This test unit 840 EVO SSD spent more than three months of the shelf, he results are pretty shocking: the months old data on the disk was only recoverable with an average read speed of 35.1MB/s. 

After formatting the disk and loading it with new data the disk averaged 430MB/s in HD Tach, there's a abvious issue with long-term degradation of data stored in the triple-bit-per-cell memory.



Samsung investigating 840 EVO slowdowns




« Shuttle Launches Broadwell-based Fanless PC · Samsung investigating 840 EVO slowdowns · Nvidia 76% - AMD 24% - GPU marketshare Q4 2014 »

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Robbo9999
Senior Member



Posts: 1690
Joined: 2012-10-07

#5020052 Posted on: 02/25/2015 04:40 PM
Sorry guys, I'm a little confused what I should be looking for. I used the program mentioned (directly after a restart and with real time scanning turned off) and got a result of 'Average Data Read Speed: 179MB'... Am I correct in thinking that while that isn't the end of the world, I am indeed affected by the issue?


Yes, I think you're definitely affected! You've probably got a SATA 2 connection have you based on the age of your system? Even so, with SATA 2 I think you can expect the high 200's not the high 100's that you've seen. You can use a program called DiskFresh to rewrite all the data on your drive to bring it back up to full speed.

AaD-Marine
Senior Member



Posts: 254
Joined: 2003-10-08

#5020071 Posted on: 02/25/2015 05:06 PM
redacted.

zipper
Senior Member



Posts: 1176
Joined: 2005-03-14

#5020104 Posted on: 02/25/2015 05:39 PM
) and got a result of 'Average Data Read Speed: 179MB'... Am I correct in thinking that while that isn't the end of the world, I am indeed affected by the issue?

My Sata 2 gives 197 MB/s - about the same.

James Frazer
Senior Member



Posts: 143
Joined: 2013-11-30

#5020290 Posted on: 02/25/2015 10:17 PM
Yes, I think you're definitely affected! You've probably got a SATA 2 connection have you based on the age of your system? Even so, with SATA 2 I think you can expect the high 200's not the high 100's that you've seen. You can use a program called DiskFresh to rewrite all the data on your drive to bring it back up to full speed.


Ah, indeed you are correct. I have an identical EVO in my ASUS i5 laptop so I'll give that a run and see what happens.

I'll have a look at the DiskFresh too... so thanks.

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