Are partitions and sectors hardware or software things? I heard things like bad partition, bad sector. Are these fixable? If yes, in my mind, these are soft things. If there is a bad partition or sector, is this fixed after the whole disk is formatted with a new installation, or will they continue to give errors and create problems? ... Can LVM be used to fix such problems? Can part of a computer's harddisk remain untouched because the installation CD misses that part of HD and ignores it, and it may contain lots of data invisible to computer admin?