Here are some BIOS pages.
Built-in Device Otions
It also has one very long screen in BIOS called Set Security Level
which defines some unknown settings. I could not find any info about this page in doc that come with notebook
There is HP application in windows called 3D DriveGuard. Here's it's description:
HP 3D DriveGuard is a feature on this computer and is only compatible with Microsoft Windows operating systems. 3D DriveGuard protects the hard drive by parking the drive and halting I/O requests when you either drop the computer, or move the computer withe the display closed while computer is running on battery power.
This means that it has accelerometers to sense movements and drops.
Is it possible that Ubuntu 9.10 has driver for this sensor and it is buggy or sensor noise is to hight for that driver and as soon as it loads it randomly blocks hard drive?
Well I know it sounds too fantastic but I am already thinking on everything...