It might not fail to you. But once hard disks starts to fail badly, it usually becomes very unreliable. The most important thing is that once the data reach the bad sectors, the data will be at risk also. So its better to be on the safe side and backup all the data and replace the drive.
The disk has no more bad sectors
and the count on any of the errors has not increased.
I have spent countless hours in the past trying to save drives. HD regenerator, Spinrite, defrag programs. Only to have them fail after temporarily breathing life back in. Not one lasted more then a couple weeks. So now I just buy a new. Much easier and less time consuming. A soon as I start getting errors I secure wipe it, sell it and replace
I've been using it daily for the past 3 months and it's still working fine. I won't be using it for any system critical applications. It's basically a spare media drive where i store and seed torrents and a place to keep various backups.
Throwing old hardware away, without even trying to fix it or find a use just seems very wasteful to me.
With HDDs it all depends on the kind of problem you have with your disk, for example if you were to suffer a head crash, then there wouldn't be much you could do to repair the disk, although if the heads weren't damaged you could partition around the damaged area.
The disk that i showed failed due to power-cuts. It would be in the middle of writing a sector and suffer from a power outage. I have a UPS now, so that won;t be a problem any more. The damage has been repaired as far as i can tell. At the moment, it just seems to be the S.M.A.R.T that is knackered, I get normal values when first opening a SMART monitor (most of the time), then leaving it on until it refreshes causes a huge amount of SMART errors.
Not all disks are irreparable once errors occur.