This is an easy way to select a startup disk before your Mac turns on. Launch the disk utility and run Verify Disk to see that your disk is not broken.
If you find such a task follow man pages to understand how to refresh that task. Your Mac will boot from the startup disk you selected. From a terminal window launch the program top which will reveal tasks that the activity monitor did not. Click the arrow directly below the drive.Select the disk you want to use as a startup disk.A screen displaying all of the available startup disks appears. Immediately press and hold down the Option key.Press the power button to turn on your Mac.The sidebar in Disk Utility should now show each available disk or other storage device, beginning with your startup disk. Select your disk in Disk Utility Choose View > Show All Devices (if available) from the menu bar or toolbar in Disk Utility. Connect the drive you want to use as a startup disk to your Mac. From the utilities window in macOS Recovery, select Disk Utility and click Continue.There’s also a way to select a startup disk immediately after you turn on your Mac. To change your startup disk back to the primary disk, repeat the instructions and select the primary disk as the startup disk. If i put any sort of CD or DVD in the slot in makes a few sounds a just pops it back out about 3 seconds later.
Select the hard disk or partition you want to use as the startup disk.Ĭlick Restart to restart your computer and boot from the selected startup disk. I recently came back from a holiday to find that my CD/DVD drive on my intel iMac has stopped working properly. Here’s how to change your Mac’s startup disk:Ĭonnect the drive you want to use as a startup disk to your computer.įrom the Apple menu, select System Preferences.
Changing Your Mac’s Startup Disk with System Preferences Normally, the startup disk is set as the hard disk inside of your Mac, but you can use an external hard drive, USB thumb drive, or DVD as your startup disk. When your Mac turns on, it loads the operating system on the designated startup disk, a hard disk or partition containing the macOS operating system.
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