Last month I experienced one of the worst but most common feeling of people relying too much on computers. I had a hard disk failure. It started with a few bad sectors and like a cancer, HDD became almost inoperable. I used ddrescue to backup the contents of the disk to another one, but quite often the disk stuck, and every following action resulted only to a new entry at /var/log/messages with "Hardware Failure" KQC. The only solution was to unplug the power from the HDD and replug it, so that ddrescue could continue backing up the disk. After 30 times doing this, I understood that due to the frequency of this hardware failures, it was impossible for me to monitor the system and reset hard disk.