Disk utility is indicating that my internal hard drive has a problem that can't be repaired. I also ran a S.M.A.R.T. test using Tech Tools and got the following result: However, my hard drive appears to be running fine - haven't noticed any degradation of performance since receiving the warnings two days ago. And HD is still running quiet (no strange mechanical noises I'm accustomed to hearing prior to a failure). Nevertheless, I'm installing a new HD tomorrow and recloning it from a backup external drive (operating from external until then). I'm just curious, are these warnings pretty reliable indicators of imminent failure?