Some 840 EVOs still vulnerable to read speed slowdowns

Some 840 EVOs still vulnerable to read speed slowdowns

The TECHREPORT Review

Some 840 EVOs still vulnerable to read speed slowdowns

Patched drives exhibit problems with old data

Last year, users discovered a problem with Samsung’s 840 EVO SSD that caused dramatic slowdowns when reading older data. Samsung attributed the issue to an algorithmic error in the management routine that tracks the status of cells over time. A firmware fix and accompanying Performance Restoration utility were issued in October, and they seemed to do the trick. However, new evidence suggests that the problem persists.

A couple of TR readers (thanks Horia and Richard) pointed me to recent entries in the original Overclock.net thread complaining of slow read performance. Those reports come from drives running the supposedly fixed EXT0CB6Q firmware, and they prompted me to test an EVO I’ve been saving for just such an occasion. The results don’t bode well for the TLC drive.

When the initial fix was issued, I patched our 840 EVO 250GB SSD and then filled it with a mix of movies, MP3s, images, and other files. That drive spent more than three months on the shelf before being called up for a round of read speed tests. Here’s HD Tach’s assessment:

Read Full Review at The TECHREPORT  http://techreport.com/review/27727/some-840-evos-still-vulnerable-to-read-speed-slowdowns

 

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