Mac Os Sierra External Hard Drive

• High Sierra works fine on external drives and internal drives, but Boot Camp, Time Machine, and FileVault are potential problems: APFS with Time Machine, Boot Camp & File Vault. You need to know before installing High Sierra whether you should stick with HFS+ or let the High Sierra installer convert the SSD to APFS.
• The file format has to be Mac OS X Journaled and you have to use the GUID partition map. To do this, open Disk Utility and connect the drive to your Mac. Under External in the left hand menu, click on your external hard drive and then click on the Erase button. Make sure you backup any data before you erase the drive.
• How to create a bootable macOS High Sierra installer drive Put the macOS High Sierra installer on an external USB thumb drive or hard drive and use it to install the operating system on a Mac.

1. Mac Os Hard Drive Space

by Shirly Chen, updated on 2017-02-10 to Mac Data Wipe

'I have a 1TB external hard drive connected with my macOS 10.12 Sierra computer. Now, it is full of junk files and virus. I was a Windows user and I don't know to how to format a hard drive under macOS 10.12 Sierra. Can anyone help me?'

There many users ask if they can format a hard drive under macOS 10.12 Sierra. If you also want to a solution for hard drive formatting under macOS 10.12 Sierra, you are at the right place. In this article, I will show easy solutions to format a hard drive or external hard drive for macOS 10.12 Sierra.

Discover the world of external hard drives for Mac. Compare portable, USB and external hard drive models for office and home and shop online.

Three Solutions to Format a Hard Drive under macOS 10.12 Sierra

If you have known how to format a hard drive under macOS 10.12 Sierra, you still can lean useful information in this article. I will offer three simple solutions to help Mac users to forma hard drive under macOS 10.12 Sierra. Please back up your important files before formatting your hard drive, no matter which solution you will choose. With these solutions, you can easily format a hard drive under macOS 10.12 Sierra. Once the formatting process gets started, your data on the hard drive will be removed.

Here are the three solutions to format a hard drive under macOS 10.12 Sierra.

Solution 1: Format hard drive under macOS 10.12 Sierra with Super Eraser for Mac

If you are going to resell, donate or give away your Mac hard drive/external hard drive, Super Eraser for Mac is your best choice to format the hard drive and permanently destroy all data. Mac os mojave system requirements. With advanced data erasure technology, Super Eraser for Mac can easily format the hard drive under macOS 10.12 Sierra and wipe all existing data/history data, beyond the scope of data recovery.

It means your hard drive will be formatted by Super Eraser for Mac, and all the data on the hard drive will be permanently erased. So please be carefully when you use it to format your hard drive. It is very easy to use. When you run Super Eraser for Mac on your macOS 10.12 Sierra computer, it will list all the hard drives and devices on your Mac. You just need to select the hard drive you want to format and click on 'Wipe Now' button. Then Super Eraser for Mac will help you completely format the selected hard drive and erase all data.

Solution 2: Format hard drive under macOS 10.12 Sierra with Disk Utility

Disk Utility is a built-in app in macOS 10.12 Sierra. You can run it on your Mac, then select the hard drive to format/erase. The formatted data can be recovered by data recovery software.

Solution 3: Format hard drive under macOS 10.12 Sierra with Start Menu for Mac

Start Menu for Mac is a smart menu bar for Mac. It can help you format a hard drive in an easy way. Just click on the format button to format your hard drive under macOS 10.12 Sierra quickly. The formatted data can be recovered by Mac data recovery software.

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Permanently and securely erase data from hard drive or external storage device under Mac OS with certified data erasure methods.

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These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.

What you need to create a bootable installer

• A USB flash drive or other secondary volume, formatted as Mac OS Extended, with at least 12GB of available storage
• A downloaded installer for macOS Big Sur, Catalina, Mojave, High Sierra, or El Capitan

Download macOS

• Download: macOS Big Sur, macOS Catalina, macOS Mojave, or macOS High Sierra
  These download to your Applications folder as an app named Install macOS [version name]. If the installer opens after downloading, quit it without continuing installation. To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server.
• Download: OS X El Capitan
  This downloads as a disk image named InstallMacOSX.dmg. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer.

Use the 'createinstallmedia' command in Terminal

1. Connect the USB flash drive or other volume that you're using for the bootable installer.
2. Open Terminal, which is in the Utilities folder of your Applications folder.
3. Type or paste one of the following commands in Terminal. These assume that the installer is in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. If it has a different name, replace MyVolume in these commands with the name of your volume.

Big Sur:*

Catalina:*

Mojave:*

High Sierra:*

El Capitan:

* If your Mac is using macOS Sierra or earlier, include the --applicationpath argument and installer path, similar to the way this is done in the command for El Capitan.

After typing the command:

1. Press Return to enter the command.
2. When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
3. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the volume is erased.
4. After the volume is erased, you may see an alert that Terminal would like to access files on a removable volume. Click OK to allow the copy to proceed.
5. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Big Sur. You can now quit Terminal and eject the volume.
   

Use the bootable installer

Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:

Apple silicon

1. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
2. Turn on your Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes and a gear icon labled Options.
3. Select the volume containing the bootable installer, then click Continue.
4. When the macOS installer opens, follow the onscreen instructions.

Intel processor

1. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
2. Press and hold the Option (Alt) ⌥ key immediately after turning on or restarting your Mac.
3. Release the Option key when you see a dark screen showing your bootable volumes.
4. Select the volume containing the bootable installer. Then click the up arrow or press Return.
   If you can't start up from the bootable installer, make sure that the External Boot setting in Startup Security Utility is set to allow booting from external media.
5. Choose your language, if prompted.
6. Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.

Learn more

For more information about the createinstallmedia command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter the appropriate path in Terminal:

• Big Sur: /Applications/Install macOS Big Sur.app/Contents/Resources/createinstallmedia
• Catalina: /Applications/Install macOS Catalina.app/Contents/Resources/createinstallmedia
• Mojave: /Applications/Install macOS Mojave.app/Contents/Resources/createinstallmedia
• High Sierra: /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia
• El Capitan: /Applications/Install OS X El Capitan.app/Contents/Resources/createinstallmedia

Mac Os Hard Drive Space

A bootable installer doesn't download macOS from the internet, but it does require an internet connection to get firmware and other information specific to the Mac model.