![]() If you want to permanently select a different startup disk in OS X, use the Startup Disk settings that are available in System Preferences. Note: You should know that selecting an alternative boot disk will only be set for the current boot session. Next time there is a bridgeOS update run the updates via terminal and it will advice to shutdown the Mac, it will then start up by itself. Start or restart your Mac and immediately press and hold the option key on your keyboard. So if you have your Mac partitioned to run Windows or a macOS beta, for example, you can select that startup disk instead of the default disk. Use the Disk Utility app on your Mac to repair your startup disk. The Startup Manager lets you choose a different startup disk during boot. Check your login items to learn if any of them are incompatible. ![]() The Internet Recovery method will require an Internet connection through which it will download a 650MB recovery image file from Apple. If your Mac successfully starts up in safe mode, choose Apple menu > Restart to restart your Mac normally. ![]() This can be invoked by holding “Option + Command + R”. If your macOS version is 10.10 or 10.11, please. Also, most systems shipped after 2010 support Internet Recovery. Mount, unmount, verify, format or set any of your Microsoft NTFS volumes as a startup drive. If your system runs OS X 10.7 or later, you can also boot directly to the recovery drive by holding “Command + R” on startup. And if you want to use an external USB DVD drive to insert a boot DVD and run it, simply connect it via USB, and the drive should appear in the standard boot menu for access. This “C” key method works both for Macs with CD drives as well as for Macs with DVD drives included. Booting from Optical DrivesĪdditionally, if your Mac shipped with an optical drive, you can simply boot to a disk in the drive by holding down the “C” key at startup. Alternatively, you can use the arrow keys to navigate the menu, and then press “Enter” to select the desired volume. When the macOS installer opens, follow the onscreen installation instructions. Select the volume containing the bootable installer, then click Continue. Once your drive appears on screen, you can easily boot to the desired disk by selecting with your mouse and clicking the arrow button. Turn on the Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes. If you want to boot using a different drive, you can simply attach an external hard drive, flash drive, or an optical disk that contains valid operating systems and when recognized they should appear alongside the current boot options. However, for systems running 10.6 or earlier, you’ll only see the main boot volume. If your system is running OS X 10.7 Lion or later, you’ll see the default Macintosh HD partition alongside a Recovery HD volume. When you’ve opened the boot menu properly, a gray screen will display that will show the available boot volumes, similar to the one above.
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