3 examples for hdparm

  # Set spin-down timeout on drive; value is zero (disabled), between
# 1 and 240 inclusive (multiples of 5 seconds) or vendor-specific
hdparm -S60 /dev/sdd  # 5 minutes
        

  # Test sequential read from harddrive.
sudo hdparm -t /dev/sdb1
        

  # Test the linux cache read speed without disk access.
sudo hdparm -T /dev/sda1