Here are some solutions for accessing the files on your Macintosh Hard Drive when your drive will not boot to the desktop.
Jan 02, 2016 Formatting a Disk Using Terminal. This method is aimed towards power users who are fond of using Terminal to do work on their Mac. It is a little longer but often comes in useful when Disk Utility refuses to perform your desired action for some reason. To format an external disk using Terminal, simply follow the steps below: 1.
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.
Aug 19, 2019 Apple's macOS platform includes Terminal, which is equivalent to Command Prompt in Windows OS. Since the macOS is based on UNIX, Terminal might give you a vibe of a dangerous tool where one wrong. Click “Clone” to start the cloning process. The content of the USB drive will be overwritten and replaced with the clone of the boot drive. Booting from a USB Drive. Once you’ve installed macOS on a USB drive or cloned your hard drive to a USB drive, you will need to restart your computer and boot from the clone drive. May 08, 2020 If your Mac is using HFS+, select Mac OS Extended (Journaled) from the format list. If your Mac is using APFS, select APFS from the format list. See Troubleshooting for more information on which format to select. If Scheme is available, select GUID Partition Map. In the sheet that appears you’ll see four options—Don’t Erase Data, Zero Out Data, 7-Pass Erase, and 35-Pass Erase. Disk Utility provides a variety of ways to erase your hard drive. Jul 08, 2014 The Disk Utility application is a powerful tool for keeping the drives that are connected to your Mac happy and healthy. But there are situations in which it may not be available. As an example.
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.
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Apple OSX Internet Recovery Article: https://support.apple.com/en-gb/HT201314
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.
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: https://support.apple.com/en-us/HT201262
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: https://support.apple.com/en-gb/HT202796
Apple Article for creating a bootable installer for OSX Yosemite (10.10) & OSX El Capitan (10.11): https://support.apple.com/en-gb/HT201372
Apple Article: Booting Into Target Disk Mode For File Transfer: https://support.apple.com/kb/PH10725?locale=en_US
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.
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You can access the Recovery Key from the Caper JAMF Software Server on campus. Log into the JSS: https://Casperserver.iowa.uiowa.edu:8443.
Using Mac Os Terminal To Zero Out A Driver
For the step by step process to retrieve a Recovery Key, see ITS Support article:http://its.uiowa.edu/support/article/104815
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