Mac User Guide
- Welcome
- What’s new in macOS Tahoe
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- Intro to Apple Intelligence
- Translate messages and calls
- Create original images with Image Playground
- Create your own emoji with Genmoji
- Use Apple Intelligence with Siri
- Find the right words with Writing Tools
- Summarize notifications and reduce interruptions
- Use ChatGPT with Apple Intelligence
- Apple Intelligence and privacy
- Block access to Apple Intelligence features
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- Intro to Continuity
- Use AirDrop to send items to nearby devices
- Hand off tasks between devices
- Control your iPhone from your Mac
- Copy and paste between devices
- Stream video and audio with AirPlay
- Make and receive calls and text messages on your Mac
- Use your iPhone internet connection with your Mac
- Share your Wi-Fi password with another device
- Use iPhone as a webcam
- Insert sketches, photos, and scans from iPhone or iPad
- Unlock your Mac with Apple Watch
- Use your iPad as a second display
- Use one keyboard and mouse to control Mac and iPad
- Sync music, books, and more between devices
- Resources for your Mac
- Resources for your Apple devices
- Copyright and trademarks
Change your Mac startup disk
You can start up your Mac from a network volume, a different disk, or another operating system. To do so, you need to change your startup disk.
Important: If you have a Mac with an Apple T2 Security Chip, added security features may need to be set in order to change the startup disk. See What is the Startup Security Utility? If you have a Mac with Apple silicon, see Change the security policy.
Change your startup disk once
Shut down your Mac, then do one of the following:
On a Mac with Apple silicon: Press and hold the power button until “Loading startup options” appears.
If you’re using a Mac mini, wait for the system indicator light to turn amber.
On other Mac computers: Press and hold the Option key as you press the power button to start up your Mac.
When you see the available startup disks, select one, then click the Continue button (on a Mac with Apple silicon) or
(on other Mac computers).
The next time you restart your computer, it starts up from the disk you selected.
Set a default startup disk
On your Mac, choose Apple menu
in the sidebar, then click Startup Disk on the right. (You may need to scroll down.)Click the icon of the disk you want to use, then click Restart.
WARNING: When selecting a network startup volume, make sure you select a network startup volume and not a network install image. Selecting a network install image reinstalls your system software and may erase the contents of your disk. A standard network volume icon appears as a globe with a folder. A network install icon appears as a globe with a downward-pointing green arrow.