hpfall is a simple daemon providing HDD shock protection for HP laptops supporting the feature officially called "HP Mobile Data Protection System 3D" or "HP 3D DriveGuard".
You need to set your HDD in
If your HDD is
/dev/sda, your config file should look like this:
# # Parameters to be passed to hpfall # DEVICE=/dev/sda
After reboot with new kernel, check if hp_accel driver was initialised correctly:
# dmesg | grep hp_accel
Testing Shock protection
Find your HDD's unload_heads file:
# find /sys -name unload_heads
Go to its directory and run:
# watch --difference=permanent cat unload_heads
Lift your laptop into free space and simulate a free fall while holding it firmly with your hands (~10 cm should be enough). If the disk protection works, you should hear your HDD making "click" sound and see one of your laptop's LEDs flashing. The watch value's background should also permanently turn black.