How to Repair Bad Sectors on Mac

What are bad sectors on a hard drive?

Bad sectors are areas on the hard drive that are damaged. These sectors make your data inaccessible. if its not fixed at the earliest, your hard drive would fail. Hence, one should repair bad sectors on Mac as soon as you realize. These sectors are formed due to 2 reasons, one due to physical damage and secondly due to logical errors. As you can guess, physical damage is caused by dust accumulation or damage caused to the rotating movement of the hard disk. These damages are permanent and cannot be repaired.

On the other hand, bad sectors caused due to logical errors can be repaired. These are often a result of your computer turning OFF suddenly when data is being written or accessed. Virus or malware attacks are also other reasons for logical bad sectors.

What happens when a bad sector is formed?

Normal operations cannot be performed on bad sectors as they don’t respond to read or write requests. When your OS come across bad sectors, it marks such sectors as bad, so operations won’t be performed on it. This prevents your computer from getting stuck each time it comes across those sectors.

What’s important to note is that files stored on those sectors may become corrupt and hence it is always a good idea to have a backup of all files on your system.

It may not be a big deal if there are a few bad sectors on your drive but if there are a large number of them, it can be indication that your hard drive is failing. And if you need to recover data from failed Mac hard drives, use Remo Recover data recovery software. All your data and partitions can be recovered easily using this tool.

How to Repair bad sectors on Mac

It is possible to repair bad sectors using a built in repair tool on your Mac. To run this tool, follow the steps below.

  1. Click on Finder on your Mac and choose Utilities
  2. In the Utilities menu, select Disk Utility
  3. Select your hard drive from the list of available hard drives on the left menu
  4. Then click on First Aid tab and select Verify Disk
  5. When you are prompted, click on Run for your disk to be repaired

Your disk will be repaired and an explanation of what has been repaired will be reported. If you don’t see any explanation of the repairs, your drive probably did not have any bad sectors.

Repeat the Verify Disk process until all the errors have been fixed and you don’t see any repairs listed in the pop-up. Once you reach that point, it means your drive has been repaired by Disk Utility and you no longer have bad sectors on your drive.

Important to know…

Bad sectors are a harsh truth and generally cannot be avoided. Of course you can take basic precautions such as shut down your system in a proper manner, always use a UPS to prevent abrupt shutdowns, invest in a good antivirus etc. but other than that you cannot predict why it happens.

But if you do encounter bad sectors, there’s no need to panic. Just make sure to always have a backup of important data and be prepared.


How to Repair Bad Sectors on Mac was last modified: September 28th, 2018 by John Harris

Customer Evangelist @remosoftware. Trying to perfect the art of writing while running a business. Fan of exceptional customer service.

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