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Hard drive with bad sectors can result in a slow computer, low performance, unexpected system crash or shutdown, etc. To fix bad sectors, you need to use CHKDSK command, which detects and repairs bad sectors automatically.
1. Open the Command Prompt (Windows Logo+R >> cmd >> Enter). Windows 7 users must run the command prompt as administrator.
2. Type now this command:
Replace c: with your own hard drive letter (D:, E:, G:, etc.)
3. Press Enter to execute this command and start the repair process. If the volume is in use by another process, then your volume will be scheduled to be checked the next time the system restarts. Type Y (Yes), then press Enter.