Bad Sector Repair: How to Fix Bad Sectors on HDD in Windows 10/8/7

What to do when a hard disk has bad sectors? This guide includes the best solutions to repair bad sectors on hard drive and protect your data effectively.

Occasionally, when one or more bad sectors come upon a hard disk, the disk will go bad. When this happens, the data in those bad sectors may be lost, but the data on the rest of the disk will be unaffected and the disk is still completely usable. In order to help you perform bad sectors repair on hard drive and rescue your data as soon as possible, we suggest you follow through with the tips below before you take action to repair bad sectors.

HDD Bad Sector Overview 

Before you start, learn the basic information of bad sectors to pick a better solution and remove bad sectors from your drive.

What Is Bad Sector

According to Wikipedia and professional IT sites, the bad sector is defied a permanently managed storage unit on a hard disk. Once the sector gets damaged, all saved information in that section is lost. Usually, the operating system like Windows 10/8/7 will skip the bad sector once it's found and marked.

Two types of Bad Sectors

Basically, there are two types of bad sectors - Hard bad sector (also called Physical bad sector) and Soft bad sector (also known as the Logical bad sector).

Hard bad sector is mainly caused by physical damage (in 1,2 causes), such as manufacturing error, physical broken, etc. While the soft bad sector is usually related to software issues (in the 3rd cause) such as improper operations on hard drive, file system error, etc.

Due to the different causes of bad sectors, the ways to repairing bad sectors are also varied. Continue reading, you will find the best solutions to repair bad sectors on your hard drive in Windows 10/8/7.

How to Check Bad Sectors in Hard Disk on Windows 10/8/7

Although we have explained that bad sectors can be defined as physical and logical bad sectors, you may still don't know how to distinguish them. Here is a simple rule for you to tell the difference: whether you can check bad sectors on your drive.

If you can run a disk checking and get the basic information about bad sectors, it's highly possible that your drive is having soft bad sectors. If not, the situation will become worse and it could be the hard bad sectors.

To know about the amount of the bad sectors clearly, a professional and free disk management tool is recommended - EaseUS Partition Master Free. It can check for bad sectors on a hard disk on Windows 10/8/7 for free with one click.

Besides, it has comprehensive hard drive partitioning options, such as resize/move partitions, create, merge, format, and wipe partitions. You can also use it to convert FAT32 to NTFS without losing data, convert MBR disk to GPT disk, or vice versa. 

Step 1. Open EaseUS Partition Master. Right-click the disk that you want to check, and then click "Surface Test".

Step 2. The operation will be immediately performed and all bad sectors will be marked as red.

When there are too many bad sectors, the scanning process will be stuck. Wait patiently. After the process, you could know exactly how many bad sectors are there.

How to Fix Bad Bad Sectors on HDD in Windows 10

As you know that when the operating system detects bad sectors, it would mark them as unusable no matter it's logical or physical bad sectors. As a result, data loss and the loss of disk capacity are unavoidable. Then, how to fix and remove bad sectors from the hard disk? Read on for in-depth tutorials. 

First Thing to Do: Back Up and Clone HDD to a Good Hard Drive (Skip Bad Sectors)

If the disk contains many soft bad sectors, always stuck or slow to load data on the computer, or the drive is failing due to physical bad sectors, it is impossible to repair bad sectors. The wise choice is to back up and save your data at first. But how to copy a hard drive with bad sectors?

EaseUS Disk Copy, a powerful disk cloning software, can skip the bad sectors and clone disk to make a full copy of your hard drive.

Some key features of EaseUS disk cloning software:

• Transfer OS to new hard drive without reinstalling Windows and applications
• Clone a larger HDD to a smaller SSD
• Clone hard drive to USB flash drive easily

Download and apply this disk copy software to upgrade and clone HDD with bad sectors to a healthy hard drive without effort.

If your computer can't boot into your operating system, create a bootable USB in advance, and then follow the steps below to copy your data. Remember to connect the new hard drive to the computer as a storage device.

Step 1: Choose "Disk mode" and select the smaller hard drive as the source disk.

Step 2: Choose the bigger hard drive to save the data and then click "Next".

Step 3: A warning message tells you that the data on the destination disk will be overwritten. Click “OK” to continue if you do not have important data on the destination disk.

Step 4: Edit the disk layout and then click "Proceed" to continue.

• "Autofit the disk" resize the layout on destination disk according to the size of it to make the disk as the best status.
• "Copy as the source" doesn’t change anything on destination disk and the layout is same as source disk.
• "Edit disk layout" allows you to manually resize/move partition layout on this destination disk.

Step 5: Wait for the process to complete.

When the cloning process finishes, shut down your computer, insert the newly upgrade hard drive into your computer and replace the old drive. If it's a system drive, set the computer to boot from a new hard drive instead of the old one in BIOS.

Repair Soft/Logical Bad Sectors in Windows 

If your hard drive is experiencing one or more bad sectors, still accessible, follow our instructions to fix your problem and remove bad sectors permanently from hard disk with bad sectors repair tools. 

 1. Run CHKDSK Command and Format Hard Drive

If there only a few bad sectors on your drive, you can run CHKDSK command and format the drive to repair those bad sectors:

Step 1. Run the CHKDSK command to fix soft bad sectors.

1. Press the Windows key and type cmd.

2. Right-click "Command Prompt" and choose "Run as administrator".

3. Type chkdsk E: /f /r /x and hit Enter. (Replace E with the drive letter of your hard drive.)

Step 2. Format hard drive to usable again

1. Open Windows File Explorer, locate and right-click on your hard drive.

2. Select "Format", reset the file system as NTFS, tick "Quick Format" and click "Start".

After this, you can save your data back to your hard drive and use it again.

2. Use a free disk check and repair tool to fix bad sectors 

EaseUS partition management software offers the simplest method to check and fix hard drive errors. You can apply its Check File System option to check and repair hard disk partition errors in Windows 10. Just download and start EaseUS partition management software, locate the hard disk, then run the check file system.

Hard/Physical Bad Sectors Repair

Mostly, when your hard drive contains hard bad sectors, you cannot repair bad sectors by using normal solutions. The only possible way is to low-level format the drive, resetting the hard drive blocks, clusters, and sectors.

A low-level format is also called a physical format. Modern hard drives are low-level formatted at the factory for the life of the drive. A PC cannot perform an LLF on a modern IDE/ATA or SCSI hard disk, and doing so would destroy the hard disk. That is to say, you can't repair a bad sector.

To resolve this issue, you have two choices:

1. Send your hard drive to the manufacturer or a local repair center, customize for low-level format.

2. Choose to clone the disk with bad sectors to a good hard drive to avoid the hard disk getting worse with more bad sectors.

Summary of Bad Sector Repair

This page provides the complete guide to help you fix bad sectors on HDD. To remove bad sectors from hard disk permanently, you can use the Windows CHKDSK command or EaseUS free partitioning software. With the two bad sector repair tools, you can efficiently fix and repair bad sectors on the hard drive, external storage devices.

In contrast to logical bad sectors, if there are physical bad sectors on your hard drive, it's almost impossible to repair your hard disk. You need to replace it with a new hard HDD. So, to avoid data loss, when you find bad sectors on your disk, be sure to use EaseUS disk clone software to copy and make a backup of your data. 

More Information About Bad Sectors

Some people may also have questions about diagnosing if bad sectors are on your drive. You may judge from the following two factors:

1. What are the symptoms of bad sectors?

When you meet one of the following symptoms, your hard drive or external storage devices may contain bad sectors:

• Strange friction sound when booting or running hard drive.
• System pops up an error message, like "Sector not found" or "General error in reading drive C", etc.
• Disk won't format, getting an error.
• Scandisk (a diagnostic utility) automatically runs when the system is booted.
• Some operations are stuck or become random to a certain process.

2. What are the causes of hard bad sectors?

1. Hard drive was shipped from the factory with bad sectors. (e.g. SSD disk)

2. Physical damage, like:

• Manufacturing error
• Accidental drop, break, etc.
• The touch of the hard drive header to the platter
• Dust

3. What are the causes of soft bad sectors

1. Software issue, like:

• Sudden shutdown of the computer
• Sectors that contain data don't match the error-correction code
• Viruses, malware messes computers, cause bad sectors.

4. How to avoid bad sectors?

Some of you may also want to know how to protect the drive from bad sector errors. Here are some tips:

• Run Disk Check or CHKDSK command on your drive regularly to remove soft bad sectors.
• Run virus cleaner software to remove viruses and malware.
• Execute proper operations on your drive, for example: close all running programs before shutting down the computer.