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bad sectors



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Based on my experiences, the difference may be that Stablebit Scanner continually monitors SMART in (close to) real-time whereas the ones you've mentioned only check when they're run, and hard drives have both an ability to repair bad sectors (somewhat) and a reserve of spare sectors that they can use to replace the bad sectors if they can't manage a repair.

Generally the timeline goes something like this: HDD gets a bad a sectors -> HDD detects the bad sector, lists it in its SMART table -> Stablebit Scanner sees the SMART table change, alerts user -> HDD manages to repair it (or "repair" it), removes the problem from its SMART table -> "How come Scanner reported a bad sector but I can't find anything now?"

The rare temporary bad sector does happen (that's why all modern drives have a reserve). However if one of your drives starts having it happen more often then that's probably an early hint that it's time to retire that drive from doing anything important.

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