# hpfall

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- Hard Drive Active Protection System

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".

## Installation

Install hpfall-gitAUR.

## Configuration

You need to set your HDD in `/etc/conf.d/hpfall`.

If your HDD is `/dev/sda`, your config file should look like this:

    /etc/conf.d/hpfall

    #
    # Parameters to be passed to hpfall
    #
    DEVICE=/dev/sda

Start and enable `hpfall.service`

## Testing

After reboot with new kernel, check if hp_accel driver was initialised correctly:

    # dmesg | grep hp_accel

### Testing Shock protection

Warning: Be careful while performing this test and keep your laptop above something soft. Simulating free fall over the desk is bad idea.

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.

Category:

- HP