Command to check the performance of the hard disk.
You can use the command given below to check the hard disk performance.
hdparm /dev/sda
/dev/sda:
multcount = 16 (on)
IO_support = 1 (32-bit)
readonly = 0 (off)
readahead = 256 (on)
geometry = 19457/255/63, sectors = 312581808, start = 0
You can replace /dev/sda with the name of your disk device.