Today I switched on my laptop and saw the LED of the HDD on for long time. It never went off. Usually it stays on while booting - around 15-20 seconds. This time the laptop didn't boot and the screen was black so I forced the shutdown. After that my laptop booted normally and the LED acted normally, but in my home folder, I discovered the file.xhb was 0 bytes.
I have Ubuntu 12.04 64 Desktop. SSD Intel 330 180gb Firmware 300i Filesystem ext4
Does anyone know how to recover that file? I have checked with photorec but that file is not in the list.