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 that.
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Use Startup Disk preferences
When you use Startup Disk preferences to select a startup disk, your Mac will start up from that disk until you choose a different one.
- I am considering adding an extra drive to my Mac Mini (possibly a tower-size one like mentioned here) and keeping it permanently plugged-in, for extra space and to leave the main Macintosh HD for essential files - system apps, my Adobe apps etc. I have a 500GB hard drive, with currently 204.68GB remaining on it, but was considering using the additional drive for the other files I create.
- We take a look at a couple of different ways to load another boot disk on your Mac. 15, 2013 12:33 p.m.
- How to Move Your Mac files to a Windows PC. Connect your external drive to your Mac, open the drive and select File. Select New Folder. Type Exported Files' and hit Return.
- To access another Mac’s files in the Finder, choose Go Network, double-click one of the computers or devices that displays, and enter your username and password. You can then browse that Mac.
Note that this article covers versions of Mac OS X Prior to Lion (Mac OS X 10.7). We also have instructions for creating a Lion-installer drive. Step 1: Disk Utility.
- Choose Apple menu > System Preferences, then click Startup Disk.
- Click the lock and enter your administrator password.
- Select your startup disk, then restart your Mac.
If you see a message stating 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 will start up from that disk once, then return to using the disk selected in Startup Disk preferences. https://launchtree216.weebly.com/true-crime-streets-of-la-mac-download.html.
- Press and hold the Option (Alt) key immediately after turning on or restarting your Mac.
- Release the Option key when you see the Startup Manager window.
If your Mac is protected by a firmware password, you can release the key when you're asked to enter the password. - Select your startup disk, then click the arrow under its icon, or press Return.
If you press and hold the Control key during this step, your selection will be saved in Startup Disk preferences, and it will be retained until you change it.
How to download raw images on mac. 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
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 these possibilities.
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. If in doubt, use the same Mac to re-install macOS on that disk.
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.
Check the 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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Check for Option ROM firmware
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 this every 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.