How to Use CMD to Remove Bad Sectors from Hard Drive

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Everything about Bad Sectors

A sector on a hard drive is a sub-region of a circular path on the disk surface, designed to hold a fixed amount of data. A bad sector is one that appears defective and fails to respond to read or write operations. There are two types of bad sectors:

Physical bad sector (hard bad sector)

As the name implies, physical bad sectors occur due to physical damage on the hard drive. These cannot be fixed by CHKDSK or any other tool. If you want to continue using a hard drive with physical bad sectors, you can use third-party tools to hide these sectors from the system and programs.

Logical bad sectors

Unlike physical bad sectors, logical bad sectors are usually caused by software issues, such as a sudden power outage or a virus attack. In most cases, the operating system will mark a sector as bad when it tries to read data from it and finds that the error-checking code doesn't match the sector's contents. Fortunately, you can use CHKDSK to fix logical bad sectors.

Recover data from hard drive first

Before we delve into how to use CMD to remove bad sectors, we highly recommend you recover data from the disk to a secure location first. The command lines used to address this issue will wipe all data from the hard drive, thoroughly destroying the directory structure and even parts of file content. Under such circumstances, it's necessary to perform data recovery in advance, and data recovery software – tools Data Recovery Wizard can help.

Please download the tool below and follow the instructions to recover your data.

Step 1: Choose a location and start scanning

Launch the Data Recovery Wizard, and hover the cursor over the partition/drive where the deleted files were stored. Click “Scan” to locate the lost files.

Step 2: Choose the files you want to recover

Once the scan is complete, select the deleted files you wish to recover. You can click on the Filter to display only the file types that you need. If you remember the name of the file, type it in the “Search for files or folders” box – this is the fastest way to locate your target file.

Step 3: Preview and recover the deleted files

Preview the recoverable files, select the ones you want to restore, and click “Recover” to save them to a new location instead of the disk where the data was lost.

How to Permanently Fix Hard Disk Bad Sectors Using CMD (UTF-8 Encoding)

With the data on the disk secured, you can now use CMD to eliminate bad sectors. If there are logical bad sectors on the hard drive, the CHKDSK command can fix them. CHKDSK is a built-in Windows utility that checks the integrity of disks and repairs logical errors it finds, including bad sectors. Thanks to its ability to fix bad sectors on HDD, it's your go-to method for repairing a corrupted hard drive without formatting.

Permanently remove bad sectors from a hard drive using the Command Prompt:

Step 1: Press the "Windows" key and type cmd.

Step 2. Right-click Command Prompt and select Run as administrator.

Step 3: In the Command Prompt, type the following command: chkdsk E: /f /r /x

Note: Replace E with the letter of the disk drive that has the bad sectors. The parameter /f tells CHKDSK to fix any errors it finds; /r tells it to locate bad sectors and recover readable information; and /x forces the volume to dismount before the process starts.

If you don't want to run the disk check and repair process from the Command Prompt, you can use the Check Disk utility, which works in the same way as CHKDSK.

Step 1: Right-click on the bad hard drive in File Explorer and select "Properties."

Step 2. Click the Tools tab.

Step 3. Click on "Check" to scan and fix bad sectors on the hard drive.

Step 2: Check and fix bad sectors on the disk to recover lost files

Utilize automated command-line tools to remove bad sectors

Download and install CleanGenius on your computer. Let's start by checking and fixing file system errors on your device.

Step 1: Click "File Display," and proceed to the next step.

Step 2: Select the target device and check the option to "Check file system for errors." Click "Run" to start fixing the problem device.

Step 3: When the process is finished, click here to open and use your device.

Bottom line

Bad sectors are damaged areas on a computer hard drive that can no longer save or store data. Any information written to a bad sector is lost. If you can't open files or programs, it's likely because your hard drive is riddled with bad sectors that prevent data from being read or becoming corrupted. To make your hard drive usable again, you'll need to use the CHKDSK tool to remove bad sectors from the hard drive. It will repair logical bad sectors and tell the system to skip over physical bad sectors.