When you run chkdsk and it validates the file and directory structure, if it comes across a bad sector, the firmware in the hard drive will remap the bad sector to the pool. And as far as the OS is concerned, that sector is still in the original location. It does this behind the back of the OS and any apps that the OS is running. The firmware on the hard drive constantly monitors the state of each sector and if it comes across a bad sector it will automatically remap the sector to one of sectors in the pool. There is a small pool of sectors that is held in reserve. In modern disk drives, you do not have access to all of the sectors. When I was having problems with Seagate drives (all 3 of them failed and had to be replaced) I was reading some of the documentation that Seagate provided (if I can ever find it again I will provide a link or a quote). I apologize for not being technically accurate. … It marks a bad sector as unusable and allocates a different, usable sector.Ĭafed00d: Which is, of course, what I meant. A sector is a physical location on the hard drive. Cafed00d: However, if either tool comes across a bad sector, the hardware in the hard drive will automatically move the bad sector to a new location.ībearran: Not quite.
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