"Chkdsk" command - what is the equivalent on the Mac?

This is how chkdsk works on a Mac

When it comes to defective SD cards, broken hard drives or other unreadable data carriers, the command "chkdsk" is often thrown into the room in the Windows world. Not without reason, because this system's own repair command has already helped in the past on my excursions under Windows to make unreadable memory cards or the like readable again.

chkdsk on the Mac - how does it work?

If you are wondering whether you have a similar command in the terminal on your Mac to repair volumes, you can relax, because the terminal is not necessary under macOS. Apple already has a utility in its arsenal that serves the same purpose as "chkdsk" on Windows: the disk utility.

The best analogy to chkdsk is on the Mac is Disk Utility.

The best analogy to chkdsk is the Mac Disk Utility, which repairs the folder structure, file permissions and the like.

Disk Utility and First Aid

The hard disk utility can be found under "Applications"> "Utilities" on the Mac. However, it is not only used to repair disks, but also helps with formatting, partitioning or creating Fusion Drives.

For us, however, the "First Aid" button is particularly important, which we can use to check and repair hard drives, USB sticks and SD cards.

The "First Aid" button triggers the repair of a volume in the hard disk utility.

The "First Aid" button triggers the repair of a volume in the hard disk utility.

 

After a query by the software, the repair of the volume can start.

After a query by the software, the repair of the volume can start.

The application is very simple. You select the volume you want to edit in the left column and then click on the first aid button at the top. After a short question from the program as to whether you really want to edit the volume, it starts.

If the check and repair were successful, you will receive an overview with details of the process.

If the check and repair were successful, you will receive an overview with details of the process.

First aid action failed

Sometimes you get an error message when you run the "First Aid" function, stating that the volume could not be deactivated. For me the error looked like this:

Repair file system.
Volume could not be repaired.
The original state (activated) is restored.
The volume cannot be deactivated for repair. : (-69673)
Action failed ...

Sometimes first aid also throws errors that have to be dealt with.

Sometimes first aid also throws errors that have to be dealt with.

This happens when some program is still accessing files on the data carrier and the system cannot unmount the hard drive or memory card.

As a solution, I would recommend closing all programs except Disk Utility and trying again. If it still doesn't work, I would restart the Mac and keep the SHIFT key pressed. So you start the Mac in, so to speak safe mode and only the bare essentials are loaded.

When the Mac has started up, you can try the "First Aid" action in the Disk Utility again.

If you have any tips for repairing data carriers, I would appreciate your comments. Certainly one or the other has a hint that can be added in the article.

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