Hi all, I am looking to collate some information off Samsung EVO owners please. I seem to have detected some pretty bad read performance degradation on 2 Samsung EVO 256GB drives that only manifests itself if you delve a bit deeper in to your drives performance. I have tested on 2 different drives on 2 completely different spec pc's bought at completely different times. Both drives are used as an OS disk and have had rapid mode enabled for some time. I am seeing read transfer speeds on areas of the disk that have been written too as low as 50MB/s!! When tested with HDTune read benchmark. Once the benchmark moves in to empty space the drive returns to your standard 450MB/s. So if you have 2 mins to spare download hdtune free edition and run a read benchmark on your EVO. Please only run it on a in use drive with some data on as running on a secured erase drive will only show perfect performance of course. Please download and use the Trial version of HD tune 5.50 - The free version has proven to give odd results - This doesn't appear to have effected the original drives issues so this is still a problem If you can post a screenshot all the better. I have seen one other user post on tomshardware with this issue and wonder if something perhaps in the latest firmware is to blame. We shall see!