Mac Os Check For Bad Sectors

Bad sectors on you hard disk prevent you from smoothly accessing your device and using the files. Luckily, you have the chance to repair bad sectors using CHKDSK command. If there is data loss on your disk after removing bad sectors from your hard disk using CMD, you can try EaseUS Data Recovery Wizard to recover your lost files.

This all-in-one software can defrag the Mac’s hard drive once it starts slowing down. Three beeps from your Mac at startup: Before the boot chimes sound at startup, your Mac will run a rudimentary check to ensure RAM is available and accessible. If not, then you will hear a series.

Quick navigation on how to repair and remove bad sectors from hard disk:

Workable SolutionsStep-by-step Troubleshooting
Fix 1. Repair Bad Sectors Using CMDPress the 'Windows' key and type cmd. Right-click 'Command Prompt' and choose 'Run as administrator'. In Command Prompt, enter the following command: chkdsk E: /f /r /x. If you don't want to perform the disk checking and repairing process in CMD...Full steps
Fix 2. Recover Data from Hard DiskLaunch EaseUS Data Recovery Wizard, hover on the partition, external hard drive, USB, or memory card where you want to perform erased data recovery, and then click 'Scan'. Select the files you want to recover. After choosing the data, click 'Recover'...Full steps

All About Bad Sectors

A sector is a subdivision of a track (a circular path on the surface of a disk) on your hard disk that stores a fixed amount of data. A bad sector is a sector that appears to be defective and it won't respond to read or write operations. There are two types of bad sectors:

Physical Bad Sector (Hard Bad Sectors)

As the name indicates, physical bad sectors are caused by physical damage on the hard disk. This type of bad sectors cannot be repaired using CHKDSK or any other tools. If you want to continue using a hard disk with physical bad sectors, what you can do is to use some third-party tool to block these sectors on the hard disk and prevent the system and programs from visiting them.

Logical Bad Sector (Soft Bad Sectors)

Unlike physical bad sectors, logical bad sectors generally result from software errors like a sudden shutdown of your computer and virus attacks. In most of the cases, the operating system will mark a sector as bad when they try to read data from the sector and find the error-correcting code doesn't match the contents of it. Fortunately, logical bad sectors can be repaired using CHKDSK.

How to Repair Bad Sectors on Hard Disk Permanently Using CMD

If there are logical bad sectors on your hard disk, you can repair them using the CHKDSK command. CHKDSK is a Windows built-in utility used to check the integrity of the disk and fix the logical errors found, including bad sectors. Being able to repair hard disk bad sectors, it is your first choice to repair a corrupted hard drive.

To permanently remove bad sector from hard disk using cmd:

Step 1. Press the 'Windows' key and type cmd.

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

Step 3. In Command Prompt, enter the following command:

Notes: 'E' is the drive letter of the disk you want to repair bad sectors from. The '/f' parameter tells CHKDSK to fix any errors it finds; '/r' tells it to locate the bad sectors on the drive and recover readable information; '/x' forces the drive to dismount before the process starts.

If you don't want to perform the disk checking and repairing process in CMD, you can choose to use the disk check feature, which works the same as CHKDSK.

Step 1. Open 'This PC', right-click the drive that has bad sectors and choose 'Properties'.

Step 2. Go to the 'Tools' tab.

Step 3. Click 'Check' to check and repair the bad sectors on your hard disk.

If you don't have any technical know-how and want to minimize data risks, using third-party software could be a better choice. The Command line is suitable for computer professionals since wrong commands can cause severe problems. Therefore, we strongly recommend you try an automatic command line alternative.

EaseUS Tools M is a practical computer fixing tool that is safe and light-weighted. It's a perfect alternative to CHKDSK command. Use this one-click tool to solve your computer issues.

To fix file system error or disk error:

Step 1: DOWNLOAD EaseUS Tools M for Free and install it.

Step 2: Open the software and select the 'File showing' option.

Step 3: Choose the drive and wait for repairing. After the operation completes, click the 'View' button to check the drive.

Recover Data from the Hard Disk After Repairing Bad Sectors

If CHKDSK stuck and failed to remove any bad sector from the hard disk, or it deleted your data on the hard disk, you may need to perform data recovery from your storage medium. In such a case, the hard drive recovery software - EaseUS Data Recovery Wizard can help.

It's almost impossible to recover data from the bad sectors since they are inaccessible. However, data recovery software may be helpful if your device becomes inaccessible because of bad sectors.

Step 1. Select a location and start scanning.

Launch EaseUS Data Recovery Wizard, hover on the partition, external hard drive, USB, or memory card where you want to perform erased data recovery, and then click 'Scan'.

Step 2. Select the files you want to recover.

When the scanning has finished, select the deleted files you want to recover. Double-click the file to preview its content if you need to.

Step 3. Recover lost data.

After choosing the data, click 'Recover' and choose a location on another drive to save the deleted data.

The Bottom Line

Bad sectors are sections of your computer's hard drive that have been damaged and have lost the ability to save and store your data. And any data stored in a bad sector is likely to be lost. If you cannot open your files or programs properly, it is most possible that the hard disk might have filled with bad sectors which make your data unreadable or corrupt. To make your hard disk usable, you should remove bad sectors from hard disk using CHKDSK, which will repair the logical bad sectors and tell the system to jump over physical bad sectors.

When bad sectors appear on the disk especially on WD My Passport hard drives, it will result in hard drive crashes or failures, poor performance, data loss disaster, system boot problems, etc., problems. Follow provided solutions on this page to protect your disk data and repair bad sectors on your WD HDD or other devices with ease:

Part 1. Check WD HDD Bad Sectors (2 Ways)
Part 2. Replace WD HDD with Bad Sectors to A Good One (No Data Loss)
Part 3. WD HDD Bad Sector Repair Tools & Solutions (4 Methods)

Western Digital hard drives are one of the popular hard drives in the world. It can become quite difficult and annoying if your WD HDD contains bad sectors. Don't worry! Follow the reliable methods below to repair bad sectors on your Western Digital HDD immediately.

Part 1. Check the WD HDD Bad Sectors

When you are faced with bad sectors on WD HDD, the first thing to do is to know the situation. You need to check the bad sectors.

To check the bad sectors on your hard disk, you need a free tool to help you. EaseUS free partition software - Partition Master and Western Digital Data Lifeguard can both help. Try any one to test and check how many bad sectors are existing on your drive.

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# 1. Check WD HDD Bad Sectors with EaseUS Partition Master Free

Trusted and recommended by millions of users, EaseUS Partition Master Free with its Surface Test feature is able to check bad sectors on hard disk, USB flash drive, pen drive, SD memory card and other storage devices without formatting. The Surface Test feature will identify bad sectors by reviewing the hard drive.

Step 1. Connect your device to PC, launch EaseUS free partition manager, right-click the WD HDD partition and click 'Surface test'.

Step 2. Wait for the operation to finish. All found bad sectors will be marked as red.

Repeat the process if your drive contains several partitions.

Once it finds bad sectors, it will make bad sectors with red color and let the operating system not to use them so to protect the saved data. You will know how many bad sectors are existing on your WD hard drive from the test result.

If there are too many bad sectors, the scanning process will be stuck. Wait patiently.
If the error is serious, with an abnormal noise coming out, during the operation, method in Part 2 may not clone your disk with data to a good drive.
What can be cloned is still a case where the error is not serious.

# 2. Test Bad Sectors Using Western Digital Data Lifeguard

Many users mistakenly take Western Digital Data Lifeguard as a bad sector repair tool as it can test the existing bad sectors on WD HDD and other types of storage devices.

It's Extended Test feature actually can only be applied to detect bad sectors. The test may take several hours (which is not as efficient as EaseUS Partition Master) depending one the size of the drive.

Step 1. Download Data LifeGuard Diagnostic ( and extract WinDlg.exe from the ZIP file.

Step 2. Right-click WinDlg.exe and select 'Run as Administrator'.

Step 3. Put a checkmark on 'I accept this License Agreement' and click 'Next' to continue.

This will let the program detect the installed hard drives on your PC.

Step 4. Select and highlight the hard disk you want to test and click the 'Run test' button.

Step 5. In DLGDIAG, select 'Option', choose 'EXTENDED Test'.

Step 6. Click 'Start', and then wait for the test to finish.

Step 7. Close the test window, and click 'View Test Result' on the new pop up window.

Check the test result and if you see Toll many bad sectors detected marked in red, you should follow part 2 to repair the bad sectors immediately.

You should know that there is no all-in-one bad sector repair tool or solution. To fully protect your data and repair existing bad sectors on your disk, follow guide tips one by one in the next two parts.

Part 2. Replace Western Digital Hard Drive with Bad Sector to A Good One

If the disk is badly damaged, it is impossible to repair the bad sectors. In case of this, your wise choice is to replace the disk and restore lost data as much as possible before bad sectors take over your WD HDD. Here we’d like to advise you to try powerful disk cloning software - EaseUS Disk Copy which is fully compatible with all OS.

Video Tutorial for Disk Cloning

For disk cloning, the video has listed the details you need to mention. If you plan to replace the western digital hard drive with bad sector to a good one, you can check the tutorial.

Do remember to connect your good new hard drive to the computer as a storage device before cloning the Western Digital hard drive with bad sectors to the good one. EaseUS Disk Copy will skip the existing bad sectors, only taking your data to the new disk.

Step 1: Download, install and run EaseUS Disk Copy on your PC.

Click 'Disk Mode' and select the hard drive that you want to copy or clone. Click 'Next' to continue.

Step 2: Select the destination disk.

Note: The destination disk should be at least the same big or even larger than the source disk if you want to copy or clone the source hard disk.

Step 3: Click 'OK' to confirm if the program asks to erase data on the destination disk.

Step 4: Check and edit the disk layout.

If your destination disk is an SSD drive, do remember to Check the option if the target is SSD.

Step 5: Click 'Proceed' to start the hard drive cloning process.

All you need to do is to wait for the process to complete. You can apply and activate this software to help you upgrade and clone the hard drive with bad sectors and restore data as much as possible.

And then shut down your computer, insert the newly upgrade hard drive to your computer and replace the old Western Digital hard drive, set the computer to boot from a new hard drive instead of the old one in BIOS. Then you can see the precious data you have restored.

If your hard drive still can work with the existing bad sectors and you have no plan to replace the disk, back up your important data to another device.
Then follow bad sector repair tools for help. Some of them may cause data loss more or less.

Part 3. Fix Bad Sectors - WD HDD Bad Sector Repair Tools & Solutions

There are many Windows built-in tools that can help to fix bad sectors on your WD HDD. Follow to see how to repair bad sectors on your disk now:

Mac Os Check For Bad Sectors

# 1. Run Disk Check in File Explorer

Open This PC in File Explorer > Right-click the WD hard drive partition and select 'Properties' > On the Tools tab, click 'Check' button under the top Error checking > Scan drive if wanted or Repair drive if errors were found.

# 2. Run CHKDSK Command and Format Hard Drive

Step 1. Run 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'.

# 3. Use CHKDSK Alternative - EaseUS Partition Master Free

The Check File System feature in EaseUS Partition Master is an alternative tool to CHKDSK command. You may also apply this feature to repair logical bad sectors on your WD HDD:

Step 1: Open EaseUS Partition Master on your computer. Then locate the disk, right-click the partition you want to check, and choose 'Check File System'.

Step 2: In the Check File System window, keep the 'Try to fix errors if found' option selected and click 'Start'.

Step 3: The software will begin checking your partition file system on your disk. When it has completed, click 'Finish'.


# 4. Perform Low-level Format

The traditional way to remove or repair bad sectors is to perform a low-level format. It will regenerate the disk layout and structure. Serious data loss is unavoidable. Also, it cannot be executed by ordinary users.

Mac Os Check For Bad Sectors Bad

A better resolution for this case is to replace hard drive with data to a good one as recommended in Part 2. If you insist, back up data to another disk first and then take your drive to the local repair center or your manufature for low-level format.


This page mainly answers the questions about 'How to test if bad sectors existing on your disk' and 'How do repair bad sectors on WD HDD'.

To test bad sectors, you may try Surface Test in EaseUS Partition Master or run Extended Test on Western Digital Data Lifeguard.

To protect your disk from being damaged by bad sectors and your previous data, you should immediately clone and replace the WD HDD with bad sector to a good drive.

Then follow the four bad sector repair tools to fix bad sectors on your WD HDD disk.

Mac Os X Check Disk For Bad Sectors

FAQs about Bad Sectors

Some of you may have even more concerns and doubts about bad sectors. Check the FAQs below, you may find a satsifying answer.

1. How to fix bad sectors on WD external hard drive?

The ways to fix bad sectors on WD external hard drive are similar to the recommended tools on this page. You may check the disk first.

If the WD external hard drive contains many bad sectors, clone it with EaseUS Disk Copy with data to a good external hard drive immediately.

If there is very a few bad sectors, run CHDKSK, Disk Check, or EaseUS Partiiton Master with its Check File System feature in Part 3 to get rid of bad sectors immediately.

2. What does recover bad sectors tool do?

Basically, there are two types of bad sector repair tools available on market.

1). Test bad sector, no repair; 2). Test bad sector, repair.

The situation mainly depends on how many bad sectors are found on the target device. For very few or soft bad sectors, Disk Check, CHKDSK, EaseUS Partition Master with Check File System feature, can all work to recover the bad sectors.

For too many bad sectors, the disk is seriously damanged, there is no way to repair them all. The best resolution towards this issue is to follow Part 2, replacing old disk with data to a new one, skiping all bad sectors.

3. Can a hard drive with bad sectors be repaired?

The answer towards this question is Yes and No.

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The reason is that bad sectors can be devided into soft bad sectors and hard bad sectors. And the answer to repair soft bad sectors on a hard drive is yes. The answer to repair hard bad sectors is no.

As for soft bad sectors repair, you can refer to Part 3 on this page for ditailed guidance. If you need more information about bad sectors, follow How to Repair A Bad Sector in Windows 10/8/7 as a guide.