When any hard drive sector is marked as dirty bit in windows, the computer will automatically start chkdsk scanning while booting. Their is no specific use of marking a hard drive sector as dirty or bad but I think it is useful if you are having any problem in running chkdsk manually.

Tutorial:-

  1. Go to Start and Select Run
  2. Type CMD and Press OK
  3. Type command fsutil dirty set [Drive Letter]
  4. Doing this will mark the specified partition with a dirty bit.

set dirty bit(In the screenshot above, we have set a dirty bit on C: Drive )

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