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HOW TO START DISK UTILITY ON MAC VIA TERMINAL HOW TO
HOW TO START DISK UTILITY ON MAC VIA TERMINAL FULL
HOW TO START DISK UTILITY ON MAC VIA TERMINAL SOFTWARE

Next, click the Security Options button at the bottom.

Choose a file system to which you want to format your external drive.

Select the disk or volume in the list on the left panel.

Click on the Erase tab (next to “First Aid”).

On your Mac, go to Applications > Utilities >Disk Utility.

Then follow the step by step tutorial below: Make sure the device can be detected by the machine.

HOW TO START DISK UTILITY ON MAC VIA TERMINAL HOW TO

More details, please go for passage about how to reset Mac admin password if forgot.First off, connect your external hard drive to your Mac. It is worth mentioning that forgotten Mac admin password can be reset in recovery mode and single user mode. Then your Mac will restart normally from hard drive. Step 3: Reboot Mac and exit single use mode.Įnter the command " reboot" and press Return key again. Then you will see the root# prompt again. Lastly, you will be prompted "The volume (name of your hard drive) appears to be OK" or "FILE SYSTEM WAS MODIFIED". Wait for it to check your Mac's hard drive, such as check extents overflow file, catalog file, multi-linked files, catalog hierarchy, extended attributes file, volume bitmap or information. Now right after the root# prompt, enter the following command and press Return key. Generally, the last line should end in root# if Mac has booted successfully in single user mode. Step 2: Check and repair current startup disk. Now you have successfully access Mac in single user mode and just wait for it starting fully about few seconds. Until you see a text-code black screen, release the keys. When you hear the startup tone, press and hold on Command + S on the keyboard.

HOW TO START DISK UTILITY ON MAC VIA TERMINAL FULL

But in order to make full use of it via command line, you should enter Mac single user mode. Way 2: Repair Mac Hard Disk in Single User Modeīesides Disk Utility in Mac recovery boot, there is also a built-in disk diagnostic and repair program called fsck or file system consistency check, which could verify the current startup disk and repair it. Note: Besides disk repair, you could also use Disk Utility in OS X recovery mode to wipe, or restore or partition disk.

Or if the errors cannot be repaired because of physical damage, you will need to replace the old damaged disk. If it cannot be done, make a backup of your data and then reformat the disk, and reinstall macOS. You need to run Disk Utility again and try to repair the damaged disk. It means the disk has not been fully repaired.

Result 3: Get "The underlying task reported failure" errors. If not, check the file content and decide if you can delete it. Check each of them to see if you can replace or recreate it. It means two or more files occupy the same space on your disk. Result 2: You will get "overlapped extent allocation" errors. Then you will receive message like "The volume (the name of disk) appears to be OK". Result 1: Nothing is wrong or no errors needed to be repaired. Click Done button to finish disk repairing when First Aid process is complete.Īt last, you will get three results generally after First Aid process. First Aid will run and check out the possible errors on preferred disk.Ĥ. Continue while you get a prompting message from First Aid.ģ. Click the First Aid on the top menu and tap on Run button to launch First Aid on Mac.Ģ. Step 3: Run First Aid to check and repair disk errors.ġ. Just click the corrupted or damaged disk from the left pane, or any other drives you want to repair.īefore checking and repairing disk errors, you can see the selected disk whether it can be verified or repaired by clicking " Info" from top menu. In the left pane, there lists the Mac startup disk and other connected drives. Step 2: Choose the disk you need to repair. Choose the Disk Utility and click Continue to open it.

HOW TO START DISK UTILITY ON MAC VIA TERMINAL SOFTWARE

Start Mac in recovery mode and you could see four options that it provides to resolve hardware or software issues. Step 1: Get to Disk Utility on Mac startup. Now let's see how Disk Utility checks and repairs disk errors. And utilities available in Mac recovery boot, such as Disk Utility, reinstall macOS etc could fix the disk issues. Way 1: Repair Disk Errors with Disk Utility in Mac Recovery ModeĪs we know, while your Mac cannot boot normally, several boot options can help to fix problems.

Way 2: File system check in single user mode.

Otherwise, not only you cannot boot Mac, but also you will lose many important files or folder on Mac.įortunately, two built-in utilities have been created in Mac for the problem. So it is urgent to check out the disk errors and repair them in time while you encounter this problem. Undoubtedly, there are lots of reasons that can lead to failed Mac boot. 2 Ways to Verify and Repair Mac Disk Errors