When ‘hitting’ a bad sector the disk will add the LBA address of the sector to the ‘pending reallocation’ list. Hard disk repair software scans the disk, allowing the disk to discover bad sectors. From this moment on, all reads and writes to LBA address 100 are redirected to the spare sector that was assigned to this address. utility you can observe and how many sectors have been reallocated this way. The disk all handles this internally:Īssume the sector at LBA address 100 can not be read and is reallocated. If a bad sector develops it can be taken out of service and replaced by one from the spare pool. Hard disks have a pool of ‘spare’ sectors. A commonly asked question is, “how do I determine, which file is affected by a bad sector?”.īad sector repair utilities do not actually repair bad sectors and often the original data in the sector is lost. Hard disk ‘repair’ software like Spinrite, DiskPatch or the hard disk manufacturer diagnostic software often identifies bad sectors in the form of an LBA address (logical block addressing).
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