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Here is a guide on how to create a bootable external Mac hard drive to run macOS from an external hard drive.

There are quite a few reasons for why you may want to be able to have an additional startup drive for your Mac. One of the main reasons is backup of your current system. Another is creating a drive for testing your Mac’s hardware. No matter the reason, having an additional bootable option on an external hard drive is definitely a good tool for any Mac user to have.

How to Make a Bootable External Mac Hard Drive

Here are the steps to create a bootable external volume to start up to on your Mac.

How to Create a Second Boot Volume

In order to create another boot volume for your Mac, you will need a form of external storage such as a hard drive. The faster the drive the better and a connection speed like Thunderbolt is preferred. You are going to be utilizing this hard drive, Disk Utility and MaOS installer from the App Store.

Use macOS Internet Recovery to boot your Mac. Instructions here - How to Start Up a Mac in Internet Recovery Mode. Once it connects to the internet and boots into recovery, you can access Disk Utility from it. Use the Disk Utility to format the new drive. Then you can use your bootable flash drive to install macOS Catalina to the new drive. The machine will start to boot from the USB drive. Way 2: Set a Mac Boot from USB Drive using Startup Disk. When you use Startup Disk preferences to set Mac boot from an external drive, so it’ll boot from that disk until you choose a different one. Here is how: Step 1: Go to Apple menu System Preference, then click Startup Disk. Another is creating a drive for testing your Mac’s hardware. No matter the reason, having an additional bootable option on an external hard drive is definitely a good tool for any Mac user to have. How to Make a Bootable External Mac Hard Drive. Here are the steps to create a bootable external volume to start up to on your Mac.

If you are running the newest version of Sierra, you will be able to use the Recovery Boot option to launch your installation of MacOS to install it on your external drive. In order to boot to Recovery, restart holding Command and R. You will then choose Reinstall a new copy of MacOS to begin the next step.

If your secondary hard drive was just purchased, you may need to open Disk Utility prior to starting your installation. You will want to ensure that your hard drive is in the proper partition scheme and is available to install to. Many drives purchased from third party retailers may come unformatted or formatted to Windows based schemes like NTFS and FAT32. In Disk Utility you will want to make sure it is set to Mac OS Extended (Journaled).

Upon starting the Install feature of Recovery, you will be presented with the option of choosing which Disk the installer is going to do its work on. You should see your current Macintosh HD and also your external hard drive. Choosing this as your install target should begin the installation process and install MacOS Sierra on your external hard drive. When the machine reboots, it will be booting to your external hard drive where you can set up an account and get to your desktop.

How to Use Your Bootable Mac Disk

Now that you have created a second bootable drive, you are able to plug it in and reboot to it at any point in time. When you wish to do this, plug in the drive and reboot your Mac holding the Option key. Much like you did when installing, you will see your Macintosh HD and your now bootable External Drive show up as options. Clicking the External will start your Mac up on this new volume.

If you have completed the setup process and have an account enabled, the Mac will perform almost identically to how it would using the built-in drive. You are able to install applications on this drive and store media and information as backup or just additional copies. Many users will actually utilize a second hard drive option strictly for work related activities and then use the built-in drive for personal use.

This method is a safe way to keep a second bootable machine safely on a hard drive in the event of your internal hard drive crashing. You will also be able to test if it is indeed an issue with your hard drive by attempting to boot to your second drive and see if you can reproduce your issue.

Having a secondary boot volume has always been a personal recommendation as it comes in handy when you need a secondary place to separate data or use as a recovery tool in the event of mishaps.

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How can I format USB drive in CMD? How to format USB using CMD to NTFS? Can I format a USB using CMD in Windows 10? Don't worry if you have the same questions in your mind.

On this page, you'll learn how to format USB using CMD or CMD alternative tool in Windows 10/8/7 successfully. Pick up the suitable USB format tool for help now:

USB Format Tool	Pros
1. Format USB Using CMD	Format to NTFS/FAT32 For professional users
2. Format USB Via CMD Alternative	Format to NTFS/FAT32/exFAT/EXT4/3/2 Convert FAT32 to NTFS without formatting For all levels of users, beginners' best choice

Notice:: As formatting will remove all saved data on the USB drive, if your USB is accessible, make sure to back up valuable USB data to another secure location in advance.

If you prefer an easy and quick way to format USB or you need to format to Ext 4/3/2, pick up CMD alternative format tool for help.

Let's start to format your USB using CMD or its alternative tool and make the RAW, inaccessible, unreadable, and even corrupted USB flash drive, pen drive, memory stick work normally again.

Part 1. How to Format USB Flash Drive Using CMD (Command Prompt)

Applies to: Format USB to FAT32/NTFS, format RAW USB, repair corrupted USB, etc.

USB flash drive is worldwide used for storing data and transferring files. However, sometimes, USB may corrupt or become inaccessible due to RAW or invalid file system, bad sector, or other errors. Formatting USB using CMD is a quick way to resolve these problems.

The following are two detailed guides, illustrating how to format a USB flash drive using Windows Command Prompt that you should strictly follow.

Steps to Format USB (to NTFS or FAT32) Using CMD

#1. Format USB using CMD in Windows 10:

Step 1. Connect USB to your PC and press Windows + R keys.

Step 2. Type cmd in the Search box and hit Enter to bring up Command Prompt.

Step 3. Type the following command lines one by one and hit Enter each time:

diskpart
list disk
select disk + number (Replace 2 with the number of your USB drive.)
list volume
select volume + number (Replace 10 with the volume number of your USB flash drive.)
format fs=ntfs quick (You can also replace NTFS with FAT32 or exFAT.)
exit

CMD also works to fix Windows was unable to complete the format error in your computer hard drive, USB, or other storage devices.

#2. Format USB Flash Drive using Command Prompt in Windows 8/7:

Step 1. Plug USB in your computer and click the Windows icon and select 'Search'.

Step 2. Type command prompt in the Search box.

Right-click on Command Prompt and choose 'Run as administrator'.

Step 3. On the Command Prompt window, type diskpart and press 'Enter'.

Step 4 Type list disk and press 'Enter'. Check the disk number of your USB flash drive. For example, disk 2.

Step 5. Now type select disk 2 and press 'Enter'. (If the USB number is not 2, replace it with the right one.)

Step 6. Type format fs=ntfs and press 'Enter'.

If you prefer other file system formats, change the command NTFS to the desired one, such as format fs=fat32.

Step 7. Type exit and hit Enter to close the window.

After this, exit DiskPart and you save data to your USB flash drive again. However, as Linux file system Ext2/3 is not compatible with Windows OS, you can refer to a UBS format tool in Part 2 for help.

Part 2. Format USB Using CMD Alternative in Windows 10/8/7

Applies to: Format corrupted USB, format USB to Ext2, Ext3, format FAT32 USB to NTFS, format USB to FAT32, etc. on all Windows OS.

Although CMD is capable of formatting USB flash drive, it's not user-friendly for most Windows beginners. Also, it requires users to remember all command lines while executing operations in Command Prompt.

Also, any importer operation may cause data loss on other storage devices. Here, we would like to recommend you try third-party CMD alternative software - EaseUS free partition manager.

EaseUS Partition Master Free Edition is a perfect CMD alternative tool for USB formatting. With an easy-to-use interface and precise operation, you can use it to format USB easily in only a few clicks.

Tutorial - 4 Steps to Format USB via CMD Alternative in Windows 10/8/7

All levels of users can apply this tool and format USB to usable again in Windows 10/8/7:

Step 1. Launch EaseUS Partition Master, right-click the partition on your external hard drive/USB/SD card which you want to format and choose the 'Format' option.

Step 2. Assign a new partition label, file system (NTFS/FAT32/EXT2/EXT3), and cluster size to the selected partition, then click 'OK'.

Step 3. In the Warning window, click 'OK' to continue.

Step 4. Click the 'Execute Operation' button in the top-left corner to review the changes, then click 'Apply' to start formatting your external hard drive/USB/SD card.

Part 3. Bonus Tips to Fix Errors While Formatting USB Using CMD

According to some USB users, they reported that they encountered some errors while formatting USB in CMD.

Here, we've collected two common errors in formatting USB using CMD, if you get the same errors, don't worry. You can follow the provided solutions to resolve them:

Error 1: Diskpart format fs=ntfs stuck at 0, 10, 11, 12...

If the formatting process gets stuck in DiskPart, as the shown message, don't worry. You have two ways to go:

#1. Just wait for the formatting process to complete.
#2. Close CMD, turn to EaseUS Partition Master in Part 2 to format your drive.

Error 2: Diskpart has encountered an error: Access is denied. See the System Event Log for more information.

If you come across this issue, click the link below to get rid of the problem:

Data Recovery is not a challenge anymore. EaseUS serves as a dependable data recovery application to retrieve lost data within simple clicks.

The End Line

Due to its portability, flexibility, large storage size, and reasonable price, USB flash drive is still the No.1 external storage device around the world.

While using USB for data transferring or storage, problems with USB flash drives also increase. Formatting USB flash drive is one of the top issues.

Best Format For Usb Flash Drive

On this page, we included two USB formatting tools to help you format USB using CMD or CMD alternative - EaseUS Partition Master. You may pick up a suitable tool and follow the respective tutorial guide to make your USB flash drive work normally.

For an easy and free formatting resolution, take EaseUS Partition Master as your first choice. It's a perfect CMD alternative tool that can help you anytime.

People Also Ask About Format USB Using CMD

Some of you may have more questions about formatting USB. Here we collected some top concerned questions and listed answers below. If you have the same doubts, check out the answers now.

1. Why do you need to format USB flash drive?

Mac Os Format Usb Drive

Usually, HDDs and SSDs are widely used for OS installation and data storage and removable storage devices like USB flash drives are more used for data transferring and storage. But the USB flash drive may become inaccessible, and you'll need to format it so as to make it work again.

Here is a list of reasons why do you and other USB users need to format the flash drive:

1. RAW, invalid, or unrecognized USB file system
2. USB flash drive corruption
3. Virus infection
3. USB is write-protected
3. Change USB file system to NTFS, FAT32, or Ext 2/3/4 by formatting

2. How to format bootable USB using cmd？

How To Format Bootable Usb

The process of formatting a bootable USB flash drive is almost the same as the process shown on this page. You can apply CMD to format it with the listed steps here:

Step 1. Connect the bootable USB drive to your PC.
Step 2. Open Command Prompt.
Step 3. Type diskpart and hit Enter.
Step 4. Type list disk and hit Enter.
Step 5.Type select disk + number and hit Enter. (Replace 2 with the number of your USB drive.)
Step 6. Type list volume and hit Enter.
Step 7. select volume + number and hit Enter. (Replace 10 with the volume number of your USB flash drive.)
Step 8. Type format fs=ntfs quick and hit Enter. (You can also replace NTFS with FAT32 or exFAT.)
Step 9. Type exit and hit Enter.

3. How to format write-protected USB using cmd?

Here are the steps that you can follow to format a write-protected (read-only) USB using the command lines below:

Step 1. Press 'Win + R', type cmd to open 'Command Prompt'.
Step 2. Type diskpart and hit Enter.
Step 3. Type list disk and hit Enter.
Step 4. Type select disk 2 and hit Enter. (Replace 2 with the write-protected device number) and hit Enter.
Step 5. Type attributes disk clear readonly and hit Enter.
Step 6. Type exit to close the diskpart window.

Once the write protection removing process completes, you can format the USB drive again. You can either apply EaseUS Partition Master, Windows File Explorer, or even the CMD command as shown in Part 2 to format the USB drive.

4. Windows was unable to complete the format, how to fix it?

When you use File Explorer to format the USB flash drive, it warns you that 'Windows was unable to complete the format', don't worry. Here are 7 ways that you can try to fix this error: