![]() If you had important data in that sector, however, it may be lost - possibly corrupting one or more files. This will show up as “Reallocated Sectors” in hard drive S.M.A.R.T. The sector will be reallocated, so reads and writes to that sector will go elsewhere. So far, there have been only a limited number of studies concerning the problem of data recovery from physically damaged Hard Disk Drives (HDDs) and. When your computer notices a bad sector, it marks that sector as bad and ignores it in the future. This is another reason why you should always back up your data - multiple copies are the only thing that will prevent bad sectors and other issues from ruining your hard drive’s data. The reality of bad sectors brings home a chilling fact - even if your hard drive is otherwise working properly, it’s possible for a bad sector to develop and corrupt some of your data. ![]() Viruses and other malware that messes with your computer could also cause such system issues and cause soft bad sectors to develop. The hard drive may have had a manufacturing error, natural wear may have worn part of the hard drive down, the drive may have been dropped, causing the hard drive’s head to touch the platter and damage some of the sectors, some air may have entered the sealed. In some cases, it’s possible for sectors on the hard drive to contain data that doesn’t match their error-correction code - this would be marked as a bad sector. On a traditional magnetic hard drive, bad sectors can be caused by physical damage. ![]() For example, if your computer suddenly shuts off due to a power outage or a pulled power cable, it’s possible that the hard drive may have shut off in the middle of writing to a sector. Soft bad sectors are caused by software issues. ![]()
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