How To Check Disk Speed in Linux From Terminal
You can check Linux disk (HDD or SSD) I/O performance with hdparm command. hdparm -Tt /dev/sda will measure show buffered and cached disk read speed.
sudo hdparm -Tt /dev/sda
/dev/sda: Timing cached reads: 17678 MB in 2.00 seconds = 8850.51 MB/sec Timing buffered disk reads: 1044 MB in 3.00 seconds = 347.94 MB/sec