How to Format Hard Drive and Fix Disk Format Errors on Mac

How to Format Hard Drive and Fix Disk Format Errors on Your Mac

Errors can damage your hard disk and prevent it from functioning properly. This post will teach you how to format your Mac’s hard disk and fix common errors.

Wondershare Recoverit Authors

Sep 28, 2020 • Filed to: Solve Mac Problems • Proven solutions

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In all likelihood, you're more acquainted with formatting an external hard drive than your Mac's internal one, aren't you? That's often the norm because there's rarely ever a need to format your internal drive. But regardless of what type it is, errors can still restrict it from reading and writing data. This means you can't store files and neither can you copy or delete anything from the drive. At times, formatting your drive could be the only logical solution to fixing it; other times, simple fixes could get it working again.

  • Part 1: How to Format Hard Disk on Mac
  • Part 2: When You Need to Format Disk on Mac
  • Part 3: Different Formats of Mac Hard Drive
  • Part 4: How to Fix Errors When Formatting Mac Hard Drive

Part 1: How to Format Hard Disk on Mac

The simple reason you might want to completely wipe your Mac's internal drive is that it has encountered one serious error or another. Apple has given you several options to choose from should you ever need to format or reformat your drive. No one needs to tell you formatting your Mac's drive entails reinstalling the macOS afterward, right? As long as you're aware of that, you're good to go.

1. How to Format New Hard Disk

Formatting a new disk, in the simplest of terms, means setting up a file system in the new drive to work with your macOS. There are different file systems, as you'll soon find out, and each has unique features that some of the other file systems may or may not have.

a) Startup your Mac and press the "Option"+ "⌘" + "R" keys to boot into "Recovery". Let go of the keys once the Apple logo or spinning globe comes on. The "Utilities" window will then show up.

format new hard disk

b) Click on "Erase" to format the new hard disk. If you're prompted, choose "macOS Extended (Journaled)" or any of the other file systems based on your needs or preference. This is also where you give the drive a name.

click Erase to format HD on Mac

c) Go back to "Disk Utility" and select "Install macOS". Restart your Mac once it's done. The end.

2. How to Reformat Hard Drive

You can think of reformatting your drive as a way to reset it by putting a new file system into the drive to supplant the old one. It can also mean putting the same file system in the drive to fix it if it's faulty. Reformatting your drive will get rid of your files, of course, but it also gets rid of any errors.

Related: Further, read and know more complete details on undeleting files on Mac.
- 2 minutes to read it.

a) Yes, you're going to be using "Disk Utility" again. Matter of fact, you'll be seeing this tool a lot throughout the article. Now, fire it up!

b) Look to the left of the "Disk Utilities" window and select the drive to be reformatted. Click on the "Erase" button.

reformat hard drive with Disk Utilities

c) Follow prompts to select a file system. Choose "Mac OS Extended (Journaled)" or another file system if you're aware of what each of them offers. Click "Erase" and let the disk be formatted. Restart your Mac and you're done here.

reformat hard drive

3. Video Tutorial on How to Format an External Hard Drive

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4. Tips for Formatting HDD on Mac


Part 2: When You Need to Format Disk on Mac

There's nothing complex about what formatting HDD is used for. It completely erases the contents of your Mac's drive. That's simple enough for anyone to understand, but the ramifications of formatting a drive are very broad. A single click of a button can mean the erasure of decades' and terabytes' worth of files. That brings up the question of when it becomes necessary for you to format the drive in your Mac.


Part 3: Different Formats of Mac Hard Drive

The file formats out there waiting to be used by you are few. Knowing the right one to choose depends on what you intend the drive to be primarily used for. Have a read below and determine which one best suits your needs.

  • APFS (Apple File System)

This is the newest file system Apple incorporated into their Mac systems, so naturally, you can expect it to be more advanced, reliable, and efficient than prior versions. APFS only works on Sierra and if your Mac's drive isn't SSD, APFS won't work for you too.

  • Mac OS Extended (Journaled)

This was Apple's default file system for their Mac systems before APFS entered the picture. There's another variant, Mac OS Extended (Journaled, Encrypted), which sees greater use by people who encrypt their drives and make passwords a necessity. Mac OS Extended (Case-sensitive, Journaled) is another variant that is case-sensitive to names of folders; folders named "CAR" and "Car" are not the same. The 4th type is Mac OS Extended (Case-sensitive, Journaled, Encrypted). It has all the distinctive features of its three brethren listed up there rolled into one.

  • NTFS

This is Windows' very own default file system but it can still be read by your Mac; writing to it it's a different story, though.

  • exFAT

exFAT is one of the more versatile file systems because it's compatible with both macOS and Windows. Either operating system can read drives formatted with exFAT, and it's capable of storing a file larger than 4GB.

  • MS-DOS FAT (FAT32)

This file system is also readable by Mac, Windows, and Linux, so if you often share external hard drives between the 3 operating systems, you might want to go with this option. It's one flaw is you can't copy files larger than 4GB in size each.

Okay, those are the file systems, but how do you know which one of them your Mac is using?

1. Open up "Disk Utility" and select the volume or drive. Open up "System Configuration" and choose "Storage".
2. Choose the volume in "Finder", then select "File" and "Get info" from the menu bar. The next window will show you the Format of the disk.


Part 4: How to Fix Errors When Formatting Mac Hard Drive

Formatting your drive should be an affair that takes up, at most, minutes of your time. But of course, this isn't always the case, is it? Sometimes, your Mac just decides to make things a little harder for you. Don't sweat it. A few solutions have been rounded up and written out for you down below.

Problem 1. Unable To Format Hard Drive

Does your Mac show you errors similar to what's in the image below? Chances are you don't even know what causes them. Thankfully, fixing them is a breeze.

unable to format hard drive

1. Open up "Utilities", then your "Applications" folder. Find "Disk Utility" from the list and launch it.

unable to format Mac drive

2. Click on "View" and choose "Show All Devices" in the dropdown menu. Next, you choose the "Top Volume" of the drive to be formatted.

unable to format Mac hard drive

3. Click on "Erase", then give a name to the drive. When it comes to "Format", you can either choose APFS or Mac OS Extended.

4. Choose a "Scheme" (go with "GUID Partition Map"). Click on "Erase" and wait until you see the green checkmark. That means it's done.

unable to format hard drive on Mac


Problem 2. Erase All Disk Data Without Backup

By now, everyone who handles large amounts of data should be diligent in making regular backups of their files, right? Nope, because there's always that one guy who only decides to do this when it's too late. Have you ever been in such a situation?

If you have, why not prepare yourself for a similar eventuality? Download and install Recoverit Mac Data Recovery to safeguard your files against accidental deletion and crashed drive; or if you simply forget to backup your data prior to formatting your drive. The steps below will show you how to do this.

Step 1. Choose a Location

Launch Recoverit and select the hard disk to be scanned (the formatted one). It will be among the other drives displayed on the first window you see once the software opens up. Click "Start."

select formatted HDD

Step 2. Scan the Location

Use "File Type" and "File Path" to narrow your search and make it easier to recover particular files-as against everything you lost. The scan will end after a given time and show you a preview of your lost files.

scan the formatted HD

Step 3. Preview & Recover Formatted Data

You will see checkboxes to the left of the Recoverit window. Those are the files you came looking for. Select particular ones or all of them. Click the "Recover" ribbon and the files will be recovered. And don't forget to save everything you've recovered onto a new drive.

recover formatted HD data

Don't bother yourself with the format of your Mac's disk or how much data you lost. Recoverit's tools and features mean it's perfectly capable of recovering data which was erased hours, weeks, months, or even years ago. Surprised? Yeah, it has that much power. Just download, install, and run it. It doesn't get any easier than that, does it?


Problem 3: Hard Drive Not Showing up

When your drive is not mounting on Mac, here are two solutions to help you.

1. Boot Mac into Recovery Mode

hard-drive-not-showing

2. Change Finder Settings

change finder settings


Closing Words

It's good to be cautious when it comes to formatting your Mac's drive but don't worry yourself by thinking it's something complicated and time-consuming. Any hard drive error you come across while using your Mac is something easily rectifiable. The only time you may need an extra set of hands to help you out is if the drive is failing due to hardware damage. And if the problem is that you've erased everything and plan on getting formatted drive data back, Recoverit is there to help out with that too. Either way, follow every step written here and you're good.

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Sue Wayne

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