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27 Dec

At some point, you may find a need to boot your Mac from a disc or a drive other than the primary Mac OS X startup volume.

Apple made it easy so all you need to know is just a simple keyboard command.

If a driver is not available or is not compatible with your system (as with some Sony notebooks), you may be able to install a modified third party driver using

Some technical experience is necessary for installing the drivers found on this site.

If you can’t update wirelessly on your i OS device, you can update manually using i Tunes on a computer that you trust.

If your computer is using Personal Hotspot on the i OS device that you’re updating, connect your computer to a different Wi-Fi or Ethernet network before you update.

Perhaps you’ve got a cloned backup of your entire Mac on an external hard drive and you want to make sure it’s bootable.

These are all potential reasons for booting to an external device, among many others.

Whether you use i Tunes or update wirelessly, you'll have the same amount of free space on your device after you update.This will bypass the selection menu and immediately start from the disc.It won’t work for USB and Fire Wire drives, though.There easiest way to boot to any device other than a Mac’s internal hard drive is to press and hold the Option key immediately after hearing the Mac startup chime.Continuing to hold this button down will bring up a menu where you can select a disc or drive to boot from.