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Nov 03, 2015 Disk Repair. After you determine the volume you need to repair, all you have to do is simply write this command (make sure you replace drive name with the actual name of your volume): diskutil repairvolume /Volumes/drive name Furthermore, if you want to repair your Mac's hard drive, then you can type. Diskutil repairvolume /. (To connect to a Wi-Fi network, follow the instructions on page 43.) 2 In the Mac OS X Utilities pane, select Disk Utility and click Continue. 3 Select the disk in the list on the left, and then click the Erase tab. 4 Select Mac OS Extended (Journaled) from the Format pop-up menu, type a name for the disk, and then click Erase. 5 After the disk is erased, choose Disk Utility Quit Disk Utility. 6 In the Mac OS X Utilities pane, select Reinstall Mac OS X and click Continue. Click on the Optionsbutton, set the partition scheme to GUID then click on the OKbutton. Set the format type to Mac OS Extended (Journaled.) Click on the Partitionbutton and wait until the process has completed. Quit DU and return to the main menu.

• How to Repair a Disk on Mac OS X from Command Line

by Vlad Tiganasu 6 years ago

How to Repair a Disk on Mac OS X from Command Line

Mac OS X comes with an easy-to-use application, called Disk Utility, that allows users to verify and repair hard disks using a graphical user interface and it is recommended for most Mac users that are not comfortable using the terminal. However, this can also be performed using the command-line. This could come in handy in situations when you can't or don't want to use Disk Utility for some reason.

In this guide, I will show you how you can repair a disk on Mac OS X using the command-line.

View Connected Devices

The first thing you need to do is start Terminal (/Go/Utilities/Terminal). Once you have done that, you need to check the names of the volumes that are currently connected to your system. You can do that using two simple commands:

Switched to Volumes Directory

Now, you terminal should look like this:

LS command

Disk Verification

Now, it is time to verify your volume and determine if it needs to be repaired or not. In order to do that, you need to type the following command (make sure you replace [drive name] with the actual name of your volume)::

For example, if you want to test your Mac's hard disk, you just need to type:

Or, if you want to test, say, an external storage device that you named 'Movies' and you are not in the Volumes folder in terminal your command should look like this:

After some time (depending on the size of the tested volume), a message will be displayed that will tell you of the current state of your drive (see image)

After Disk Verification

As you can see, after I've tested my Mac's hard drive (named System), the message was 'The volume System appears to be OK'. If, instead of this message, the test returns a message like 'The volume System was found corrupt and needs to be repaired', then it is time to start fixing the problem.

Disk Repair

After you determine the volume you need to repair, all you have to do is simply write this command (make sure you replace [drive name] with the actual name of your volume):

Furthermore, if you want to repair your Mac's hard drive, then you can type

Conclusion

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As the message from the terminal window says, you have successfully repaired your drive using the command-line version of Disk Utility. Even if it is commonly considered hard to use by some Mac users, the command-line is a very helpful feature and, if you have followed the guide, you should have your volumes fully repaired.

If you receive an error when trying to repair your drive using the command-line, then you might want to restart your Mac in recovery mode (using the Command-R key combination) and retype to repair command or simply use Disk Utility (might be easier for you using the GUI version).

If you keep having problems with your drive, then you should try the fsck approach (a more advanced command-line repair mode) or your drive might be physically damaged, in the latter case you should start creating backups of your data and get a new drive.

Dec 21, 2020 • Filed to: Solve Mac Problems • Proven solutions

Recovery Mode in OS X provides a set of solutions for users to utilize when users need to repair and reinstall their operating system in an emergency. You can also reset the Mac password using recovery mode if needed. There are several ways to boot Mac into recovery mode. If you find one method overwhelming, there are several other alternatives you can use. We will walk you through the different ways on how to boot Mac into recovery mode so that they will become undoubtedly useful in a rare emergency.

Part 1: How to Boot Mac in Internet Recovery Mode

Along with the introduction of a locally stored recovery volume, Apple introduced its Internet Recovery service that allows your operating system to download contents of the recovery hard disk partition from the company's service. This option is great to use when your local drive is completely corrupted and you no longer can access locally-stored recovery tools.

To launch Internet Recovery, make sure your Mac is connected to a WiFi network and follow the steps below:

1. Reboot your Mac.
2. Hold the 'Options', 'Command', and 'R' buttons until the boot chimes are triggered.
3. Wait until the system finished downloading the recovery tools from Apple's website.

It is noted that you are unable to boot Mac into Recovery Mode if you are using devices older than the ones below:

• MacBook Pro (13-inch, Early 2011)
• MacBook Pro (15-inch, Early 2011)
• MacBook Pro (17-inch, Early 2011)
• iMac (21.5-inch, Mid 2011)
• iMac (27-inch, Mid 2011)
• MacBook (13-inch, Mid 2010)
• MacBook Pro (13-inch, Mid 2010)
• Mac mini (Mid 2010)
• MacBook Pro (15-inch and 17-inch, Mid 2010)
• iMac (21.5-inch and 27-inch, Mid 2010)
• MacBook Air (11-inch and 13-inch, Late 2010)

Part 2: How to Create a bootable drive into Recovery Mode

You can create a bootable drive to store an OS X Recovery Disk so that you can access recovery tools anytime, anywhere. It would be great if you could invest in a high-capacity USB 3.0 flash drive to store the required tools.

There are plenty of articles outlining how you can create a bootable OS X Recovery Disk, including ours. Once you have this established, you can follow these steps to get your Mac into Recovery Mode:

1. Reboot your Mac.
2. Hold down 'Option' on your keyboard once you hear the chime sound.
3. Attach your bootable OS X Recovery Disk to your Mac and select it from the prompt list.
4. Your Mac will launch into Recovery Mode and you can start fixing your Mac.

As you can see, there are plenty of methods you can use to boot Mac into Recovery Mode. There is no need to panic when you find yourself in trouble - just choose and master the method that seems least intimidating to you and you will be well on your way. After you boot Mac into Recovery Mode, you can also restore your data on Mac.

Part 3: How to Boot Mac with Installation Disk

If you are using an older Mac, it probably comes with a grey recovery DVD that you can use to run recovery routines. If you had bought a copy of a newer operating system, you can also use the installation disk to perform recovery.

It is the easiest way to go into Recovery Mode and here is how you can do it:

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1. Insert the grey DVD and reboot your Mac.
2. Hold down 'C' on your keyboard until you hear the boot chimes.

The recovery tool will take some time to load. Follow the wizard that will put your Mac into Recovery Mode.

Part 4: How to Boot Mac into Recovery Mode with Local Recovery

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1. Reboot your Mac.
2. Hold the 'Command' and 'R' buttons until the boot chimes are triggered.
3. You will see the OS X utility window that will prompt you to choose one of the four options.

Part 5: How to Boot Mac into Recovery Mode from Time Machine

It is really important to keep backups of your machine and Apple facilitates this with its Time Machine feature. It would be best to store your backup on an external drive so that you can initiate Recovery Mode using this when your hard drive is wiped out.

Follow these steps to boot Mac into Recovery Mode:

1. Reboot your Mac.
2. Hold down the Option button when the startup chimes sound.
3. Connect your Time Machine drive. It will take some time for the system to detect the drive. You might need to key in your password.
4. Choose the drive to launch your Mac into Recovery Mode.

After all the above methods, you finally fail to boot your Mac into Recovery mode. Don't worry. We also provide further solutions for you - Fix 'Cannot boot into Recovery mode'. For those who need the data recovery solution, Recoverit would be a nice option. Free download and try it now.

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