In some HP Laptops have 3d drive guard system . i dont how it works but there is a link about it. In windows hp depends it but i didnt find a driver about it for linux .
HP 3D DriveGuard protects the hard drive (HDD) by "parking the heads" if the notebook is accidentally dropped or is abruptly impacted by another object.
Is there a driver for this for Ubuntu?
Yes, there is and you can find it here and it is named hpfall. It is a kernel module.
Unfortunately it has not been implemented in Ubuntu 11.10, 12.04 or 12.10 and the PPA is not up to date. On the other hand, jou can just install the package for Natty and it works for Ubuntu 11.10, 12.04 and 12.10.
On the page it shows how to add a PPA (Personal Package Archive). In short add these to lines to your sources:
deb http://ppa.launchpad.net/pmjdebruijn/ppa/ubuntu natty main
deb-src http://ppa.launchpad.net/pmjdebruijn/ppa/ubuntu natty main
From command line you can also do the following
sudo add-apt-repository ppa:pmjdebruijn/ppa
Update the sources with sudo apt-get update and Ubuntu software center will show you hpfall when you search for it.
