how to clean up your startup disk macbook pro

Of course if you turned this off because you plan on running Windows 10 from an external drive, or maybe a different version of macOS from an external volume, or you intend on using any other boot disk whether a USB macOS installer or linux installer, you’ll need to keep the feature disabled to continue to allow booting from that or any other external disk. You can do that by simply repeating the steps above but instead checking the box for “Disallow booting from external media” to again restrict external boot drives. If you’re allowing booting from an external drive for the purpose of performing a clean install or a system software update, you’ll likely want to disable external boot volumes when you’re finished doing so. You can also change the startup disk from within System Preferences in MacOS. To boot from a connected external volume, connect the boot drive if you haven’t done so already, then hold down the OPTION key during system restart and select it during system start. Exit out of Startup Security Utility and restart the Mac as usualĪt this point, booting from an external drive is the same as it always is.At the Startup Security Utility screen, check the box for “Allow booting from external media.” to enable external drives too boot the Mac.Enter the admin password when requested again.Authenticate with an admin user account, and at the macOS Utilities screen, pull down the “Utilities” menu and choose “Startup Security Utility” from the menu bar options.

Turn on or reboot the the Mac and immediately hold down COMMAND + R keys once you see the  Apple logo on screen, continue to hold Command+R until the Mac boots into MacOS Recovery mode.How to Enable & Allow External Drive Booting on Mac with T2 Chip Let’s walk through how you can allow a T2 equipped Mac to boot from external startup drives, whether they’re an external hard drive, external USB flash drive, or any other external disk that you’d like to boot the Mac from.Īgain, this is only necessary on modern Macs with a T2 security chip, including MacBook Pro with Touch Bar, MacBook Air with Touch ID, modern Mac Pro, the latest Mac mini, and latest iMac models.

How to clean up your startup disk macbook pro