Boot Hdd For Mac

Here are some solutions for accessing the files on your Macintosh Hard Drive when your drive will not boot to the desktop.

A Mac can be started via a USB port, with a USB key or external hard drive, but that device needs to have Mac OSX system installed on it to boot, as well as other requirements. Best bet is to always backup your Mac hard drive with a bootable image created by Apple Disk Utility or a third party utility such as Carbon Copy Cloner. The easiest way to keep your files backed-up is by using Time Machine, which is built in to the Apple OS. The only requirement for Time Machine is to have an attached hard drive to back your files up to.

If you don't have a bootable backup, or a way to get a Mac drive, you will need to boot the computer from another operating system.

First, try to boot your Mac in Recovery mode, holding down Cmd-r on restart. If that doesn't work, try for Internet Recovery, which is restart and hold down Cmd-Opt-R.

Apple OSX Internet Recovery Article:

Secondly, you can try to boot your Mac into Safe mode to see if you can boot to a minimal desktop.

Start or restart your Mac. Immediately after you hear the startup sound, press and hold the Shift key.

GParted (Free) GParted is a free partition editor to manage your disk partitions. It’s available for.

  • Restarting would often free up 20 to 40GB of disk space on the mini’s internal 500GB hard drive. (See this Mac 911 column for more about caches.) But the Mac wasn’t any faster after a restart.
  • Turn on your Mac, then press and hold Command (⌘)-R immediately after you see the Apple logo to start up from macOS Recovery. When you see the macOS Utilities window, choose Utilities Startup.
  • My current OS is Mac OS and Windows 7 in bootcamp. Since my Mac Pro only has a 256 GB HDD, I would like to install Ubuntu on an external disk, so I went ahead and bought a USB3.0 Portable Hard Disk, which has 500GB space. How should I proceed to install Ubuntu 14.04.1 LTS on an external HDD and boot.
  • Download the Windows 10 ISO disk image from Microsoft using this link. Choose the 64-bit version.

Release the Shift key when you see the Apple logo appear on the screen.

After the Apple logo appears, it might take longer than usual to reach the login screen or your desktop. This is because your Mac performs a directory check of your startup disk as part of safe mode.

To leave safe mode, restart your computer without pressing any keys during startup.

Apple Article on booting your Mac into Safe Mode:

If neither of those work, find another Mac, connect it to your Mac with Firewire or Thunderbolt cable. Then reboot the non-bootable Mac holding down the 't' key, which puts it in Target Disk Mode. If this works, the Mac hard drive will appear as a mounted drive on the other Mac.

Apple Article on installing OSX on an External Hard Drive so you can boot from it:

Apple Article for creating a bootable installer for OSX Yosemite (10.10) & OSX El Capitan (10.11):

Apple Article: Booting Into Target Disk Mode For File Transfer:

Once you have booted from an external drive, and you can mount the you hard drive that was not booting, you can search the drive for files to recover, beginning with the files that are in the /Users/Home/ Directory.

Accessing Hard Drives That Have Been Encrypted Using File Vault

If the hard drive you are trying to recover data from has been encrypted with File Vault, and you don’t know the login password, you will need to use a Recovery Key to login into the drive so you can access the data.

BootBoot disk for mac pro

You can access the Recovery Key from the Caper JAMF Software Server on campus. Log into the JSS:

Boot hdd for mac catalina

For the step by step process to retrieve a Recovery Key, see ITS Support article:

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.

Download macOS

Boot Disk For Mac Yosemite

Find the appropriate download link in the upgrade instructions for each macOS version:

macOS Catalina, macOS Mojave, ormacOS High Sierra
Installers for each of these macOS versions download directly to your Applications folder as an app named Install macOS Catalina, Install macOS Mojave, or Install macOS High Sierra. If the installer opens after downloading, quit it without continuing installation. Important: 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.

OS X El Capitan
El Capitan downloads as a disk image. 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. Make sure that it has at least 12GB of available storage and is formatted as Mac OS Extended.
  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 still 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.

    High Sierra:*
    El Capitan:
  4. Press Return after typing the command.
  5. When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
  6. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the bootable installer is created.
  7. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Catalina. You can now quit Terminal and eject the volume.

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

Use the bootable installer

After creating the bootable installer, follow these steps to use it:

Boot Hard Drive Macbook Pro

  1. Plug the bootable installer into a compatible Mac.
  2. Use Startup Manager or Startup Disk preferences to select the bootable installer as the startup disk, then start up from it. Your Mac will start up to macOS Recovery.
    Learn about selecting a startup disk, including what to do if your Mac doesn't start up from it.
  3. Choose your language, if prompted.
  4. A bootable installer doesn't download macOS from the Internet, but it does require the Internet to get information specific to your Mac model, such as firmware updates. If you need to connect to a Wi-Fi network, use the Wi-Fi menu in the menu bar.
  5. 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 this path in Terminal:



High Sierra:

Boot Disk Mac Os

El Capitan: