Bad Sector , recovery, fsck

[Andrew Konosky]

It could be a sign that your hard drive is going bad. Small sectors of 
the disks will become unreadable and the capacity of the drive will 
decrease as those sectors fail. You can continue to use it as long as 
you have all your data backed up in case it does decide to die all of 
the sudden. I had this happen on a really old system. The drive started 
having the occasional bad sectors, then it was happening every boot-up, 
then a week or two later it refused to boot.