Found inside – Upon restart, a new, empty file will be created. For example, if you install macOS or Windows on an external drive, your Mac can recognize that drive as a startup disk. The “Your startup disk is almost full” message means exactly what it says. If this happens, reboot the Mac while holding down the Option key on the keyboard. For startup disk, start or restart your Mac, then press-hold Command + R keys. From the Mac Finder, pull down the “Go” menu and choose “Go To Folder”. Not surprisingly, many of the startup modifiers affect the disk used to boot the Mac.
Found insidePresents fifty hacks to customize performance of a Mac, including automating tasks, increasing security, playing Wii games, and modifying wifi. Click the Startup Disk icon in System Preferences, or choose View > Startup Disk.
