Drive Samsung SSD 850 EVO 500GB hdparm -t /dev/sda Timing buffered disk reads: 1542 MB in 3.00 seconds = 513.42 MB/sec Drive TOSHIBA MK5055GSX 500GB hdparm -t /dev/sdb Timing buffered disk reads: 228 MB in 3.03 seconds = 75.36 MB/sec