I bought a Samsung 840 EVO 250GB SSD some moths ago (in March).
I was suspecting a not-super speed but some days ago I got it tested with HD Tune and I was astonished... In the zone used by O.S. and softwares (first 40 Gb) the sequential read speed was around 40MB/s (see screenshot), slowest than my mechanical HDD...
Do you think it is normal for a randomly written data, that the read speed is SO slow for this model? Or it is a factory defect and I just have to get it replaced in RMA?
Before you ask: S.M.A.R.T. values are OK and Samsung Magician says all good and the firmware is the latest.
Yes I think everything is optimized and working good also because as you see in the empty zone, the transfer rate is very high (500MB/s), and I repeated the test some times with the same results. If it was for a malware, the results would be random. The partition is aligned correctly (just cheked with as-ssd but I knew it was the default in windows 8.1).