Apparently all EVO series with TLC memory including this disk is defective. After a few months time use the speed collapses dramatically. My 1TB mSATA is currently at 10MB / s (!) This is now no joke or an isolated incident. On the Internet there is enough information on this issue. That brought out update creates a remedy for a short time. After a month the speed problem was back. Samsung is now trying to serve out the problem in order to achieve as little as possible redemptions. The customer is put off, for months is no improvement in sight.
Who buys this disk will experience no SSD speed advantage and also is taking a huge risk of data loss.