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Samsung acknowledged there is a serious read performance bug on this drive
on September 23, 2014
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. The odd part is that the bug only seems to affect old data (>1 month) associated with them because freshly written data will read at full speed.
Samsung has acknowledged the issue and is working to fix it by a new firmware.
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