Linux Check IDE / SATA SSD Hard Disk Transfer Speed

[nixcraft]

Originally published at: https://www.cyberciti.biz/tips/how-fast-is-linux-sata-hard-disk.html

So how do you find out how fast is your hard disk under Linux? Is it running at the SATA I (150 MB/s) or SATA II (300 MB/s) or SATA III (6.0Gb/s) speed without opening computer case or chassis?