Frequently Asked Questions
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By default, your Mac starts up from its built-in hard disk, but a startup disk can be any storage device that contains an operating system compatible with your Mac. For example, if you install macOS on an internal or external drive, your Mac can recognise that drive as a startup disk. You can then follow the steps in this article to start up from it.
Use Startup Disk preferences
When you use Startup Disk preferences to select a startup disk, your Mac starts up from that disk until you choose a different one.
If you see a message that your security settings do not allow this Mac to use an external startup disk, check the External Boot setting in Startup Security Utility.
Use Startup Manager
When you use Startup Manager to select a startup disk, your Mac starts up from that disk once, then returns to using the disk selected in Startup Disk preferences.
If your Mac is using OS X Lion 10.7.3 or later, you can also use this method to start up from your Time Machine backup disk. Startup Manager identifies your Time Machine backup as ”EFI Boot”.
If you can't select your startup disk or start up from it
Check for these possibilities if you can't see your disk in Startup Disk preferences or Startup Manager, or your Mac won't start up from it.
Check for a compatible operating system on the startup disk
Make sure your startup disk is using a version of macOS that is compatible with your Mac.
Jan 08, 2011 sudo /Applications/TextEdit.app/Contents/MacOS/TextEdit /etc/hosts Use TextWrangler to edit the file instead. Also, when I typed this in the first time, it prompted. Jun 24, 2010 Editing some files on an OS X system requires superuser or root permissions. Typically, this is accomplished using sudo (which lets authorized users assume superuser powers, cape and tights optional) and vi. To the uninitiated, vi can cause intestinal distress and hair loss. An alternative is the use of TextEdit, the graphical text editor application,. Cancel Duplicate' The hosts file belongs to the root user and while anyone can easily open the hosts file in TextEdit, one cannot just edit it unless opened as root, as suggested in the accepted answer, although that too may have issues all these years later. – user3439894 Jan 3 '19 at 18:56. Since the root user is disabled, the only way to force an arbitrary OS X app to have root permissions is to enable root and log in as root. Apps can of course use API to ask the system for authentication and pop up the dialog you expect when asked for an administrator user and password. Sudo /applications/textedit.app/contents/macos/textedit /etc/hosts illegal instruction. Feb 16, 2011 How to edit HOST file in mac the EASY way sudo /Applications/TextEdit.app/Contents/MacOS/TextEdit /etc/hosts.
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To start up from an external disk with macOS Catalina 10.15 or later, the disk must be connected via USB-A, USB-C or Thunderbolt, not FireWire.
App Mac Gestionnaire De Storage UnitsCheck startup security settings
If you're using a Mac that has the Apple T2 Security Chip, check the settings in Startup Security Utility. These settings determine whether your Mac can start up from another disk.
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If you're in Startup Manager and can't see a third-party startup disk, the startup disk could be using Option ROM firmware. To enhance system security, Mac computers with up-to-date software don’t display devices that use Option ROM firmware until you load their firmware. To do that, press Option-Shift-Command-Period while in Startup Manager. If your startup disk appears, do that each time you want to start up from it or from another disk connected to it.
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If you're using a firmware password, the ability to load Option ROM firmware is disabled as an additional security protection.
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