By AOMEI / Last Updated January 17, 2019

What happens when the disk has bad sector?

When the hard disk is used for a long time, various problems may occur, and the “bad sector” of the hard disk is the most common problem among them. As the name suggests, a bad sector is a sector on a computer’s disk drive or flash drive. It is inaccessible or un-writeable due to physical damage to the disk surface or failed flash memory transistors. The usual non-standard use (ex: the memory is too small for the application software frequently accesses and reads & write to the hard disk, Fragment hard disk too frequently, Inappropriate overclocking, Low quality power supply, Dust entering, etc.) can cause damage to the hard disk. If the hard disk has bad sectors, the data on the hard disk may be lost. Therefore, you need to repair bad sectors in Windows 10/8/7, and back up important data in time to avoid data loss.

How to repair bad sector in Windows 10/8/7?

To repair bad sectors, the following guide provides you two methods to do this operation.

Method 1. Repair bad sector with Windows built-in tool

Check and Repair hard drive

You can perform a preliminary check at first by Windows built-in tool – CheckDisk. CHKDSK can be used to check the integrity of a file system and bad sectors of a disk. CHKDSK also recovers the file system and the logical & physical errors of the hard disk. Let’s see the specific steps of checking disk:

1. Press “Windows” + “R” to open the Run box, typing “cmd” and press “Enter”.

2. Input “chkdsk g: /f” and press “Enter”. This will check and fix errors that it found on G: volume. (Here “g” is the drive letter of the disk you want to check.)

Now, you can see the information of the disk like disk space parameters, file size, and the number of bad sectors.

Method 2. Repair bad sector with third party software

Still cannot fix bad sectors after following the guide above? Actually, if you are not familiar with the command line, it may cause other problems due to incorrect operation. But don’t be worry! In addition to using the Windows built-in tool to fix bad sectors, you can also use a third party bad sector repair software to easily complete this operation. Here AOMEI Partition Assistant is highly recommended. It is a professional free bad sector repair tool, you can use it to easily and effectively repair/fix bad sectors on the hard disk or flash drive in Windows 10/8/7, Windows XP, as well as Windows Vista. the following example will show you the specific steps of repairing bad sectors in Windows 7:

Step 1. Download, install and run AOMEI Partition Assistant. Right click the partition you want to check and select “Advanced” > “Check Partition”.

Check Partition

Step 2. In the pop-up window, select the way of checking errors to perform. There are three choices, and here we choose the first one “Check partition and fix errors in this …”. Then, click “OK” to continue.

Check Partition and Fix Errors

Step 3. After that, you will see the window below. After the progress completed, click “OK”.

Operation Completed

Thus, you have already check and repair the bad sectors successfully.


Till now, you know how to easily check and repair bad sectors. If there are important data in the bad sector, you’d better send the hard disk to the professional data recovery center to recover the data directly. To fix the bad sector, AOMEI Partition Assistant can be a wonderful choice, it’s easier than the command line. Besides Check Partition, it also provides users many other powerful functions like Migrate OS to SSD, format partition, Rebuild MBR and so on. If you delete a partition by mistake one day, and you want to recover data from the deleted partition, you can upgrade to AOMEI Partition Assistant Professional to solve this problem.