# hdparm -B 255 /dev/sda; smartctl -d ata -a /dev/sda

/dev/sda:
 setting Advanced Power Management level to disabled

# smartctl -d ata -a /dev/sda | grep Load_Cycle_Count; sleep 5; smartctl -d ata -a /dev/sda | grep Load_Cycle_Count
225 Load_Cycle_Count        0x0012   044   044   000    Old_age   Always       -       566581
225 Load_Cycle_Count        0x0012   044   044   000    Old_age   Always       -       566582