Hard Disk

How to fix the bad sector of hard disk?

Bad sectors for a hard drive cannot be fixed. There will be various promotional offers about curing your bad sector, but don't run after them. Actually they are not curable. You can at the best de-fragment your hard drive to put the bad sectors aside and not interfere with normal functioning of your operating system.

Chkdsk should allow the HDD to automatically map those out as bad sectors. You should not need to do anything. They are not curable as mention above.

Hard plate is an inflexible non-removable attractive circle with an extensive information stockpiling limit.

Run CHKDSK Command and Format Hard Drive.
Run the CHKDSK command to fix soft bad sectors.
Format hard drive to usable again.
Use a free disk check and repair tool to fix bad sectors.

For data recovery on disc, try the partition Partition Recovery. I have been using this software for a long time.