Boot your Mac from CD, DVD, external drive, or USB flash drive. 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. Realtek 11N Usb Wireless Lan Utility Driver Free Download on this page. Apple made it easy so all you need to know is just a simple keyboard command. A Boot Method For The Installer Is Unable To Install' title='A Boot Method For The Installer Is Unable To Install' />ESXi and vCenter Server 5. Documentation VMware vSphere ESXi and vCenter Server 5. Documentation vSphere Installation and Setup Updated Information. Lets say you need to use the Mac OS X installation disc that came with your computer to reformat the hard drive and put it back to factory settings. Or maybe youre trying to boot from a USB flash drive that has a clean install of OS X on it for troubleshooting purposes. Perhaps youve got a cloned backup of your entire Mac on an external hard drive and you want to make sure its bootable. These are all potential reasons for booting to an external device, among many others. There easiest way to boot to any device other than a Macs internal hard drive is to press and hold the Option key immediately after hearing the Mac startup chime. Steve Mcconnell Rapid Development Ebook Pdf Biz there. Continuing to hold this button down will bring up a menu where you can select a disc or drive to boot from. Use the keyboard arrows to choose your boot device, then press the Enter key. Overview. Briefly, a boot loader is the first software program that runs when a computer starts. It is responsible for loading and transferring control to an. The computer will start up from the chosen volume, but bear in mind performance will likely be much slower than when you normally operate your Mac. This is especially true of USB flash drives. Rather than hold the Option key, you could instead just press hold the C key if youre booting from a CD or DVD disc. This will bypass the selection menu and immediately start from the disc. It wont work for USB and Fire. Wire drives, though. Booting to another volume using either of these methods is a one time temporary change, so you dont have to worry about altering any settings to reverse it. Your Mac will go back to booting to its primary startup disk next time you reboot.