Samsung Acknowledges the SSD 840 EVO Read Performance Bug - Fix Is on the Way

Stefan Mileschin · 22nd September 2014, 08:25

During the last couple of weeks, numerous reports of Samsung SSD 840 and 840 EVO having low read performance have surfaced around the Internet. The most extensive one is probably a forum thread over at Overclock.net, which was started about month ago and currently has over 600 replies. For those who are not aware of the issue, there is a bug in the 840 EVO that causes the read performance of old blocks of data to drop dramatically like the HD Tach graph below illustrates. The odd part is that the bug only seems to affect LBAs that have old data (>1 month) associated with them because freshly written data will read at full speed, which also explains why the issue was not discovered until now.

http://www.anandtech.com/show/8550/s...-is-on-the-way

22nd September 2014, 08:25	#1
Stefan Mileschin [M] Reviewer Join Date: May 2010 Location: Romania Posts: 148,618	Samsung Acknowledges the SSD 840 EVO Read Performance Bug - Fix Is on the Way During the last couple of weeks, numerous reports of Samsung SSD 840 and 840 EVO having low read performance have surfaced around the Internet. The most extensive one is probably a forum thread over at Overclock.net, which was started about month ago and currently has over 600 replies. For those who are not aware of the issue, there is a bug in the 840 EVO that causes the read performance of old blocks of data to drop dramatically like the HD Tach graph below illustrates. The odd part is that the bug only seems to affect LBAs that have old data (>1 month) associated with them because freshly written data will read at full speed, which also explains why the issue was not discovered until now. http://www.anandtech.com/show/8550/s...-is-on-the-way

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