> hdparm does not set anything by default. I suspect this is going to be
> one of the power management frontends, but I don't know which one you
> have installed. Please let me know which one you have installed
> (acpi-support, gnome-power, etc) so I can reassign to the appropriate
> one.
acpi-support is at least one culprit:
in /etc/acpi/start.d/90-hdparm.sh we have:
# This script adjusts hard drive APM settings using hdparm. The hardware
# defaults (usually hdparm -B 128) cause excessive head load/unload cycles
# on many modern hard drives. We therefore set hdparm -B 254 while on AC
# power. On battery we set hdparm -B 128, because the head parking is
# very useful for shock protection.
which results, after some hours of using Debian on a new laptop:
# smartctl -a /dev/sda | awk '/Power_On_Hours/ {po=$10}
/Load_Cycle_Count/ {cyc=$10} END {print "load cycles: "cyc", cycles
per hour: "cyc/po", lifetime: "(300000*po/cyc)/24" days"}')
load cycles: 2441, cycles per hour: 56.7674, expected lifetime: 220.197 days
(i do not know if this is what the original poster has installed)
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