• You may need to start your Mac using an external drive or boot volume rather than a startup disc from time to time. The importance of booting from an external disc cannot be overstated. You could want to solve some issues, repair the drive, create partitions, format the entire disc, update, and install OS X, among other things. When you utilise an external boot volume to start your Mac, all of these things work correctly.
• To begin, you'll need a Mac that runs on Intel.
• Second, the bootable CD or DVD must have Apple's Super Drive, or if using a USB drive, it must be formatted with GUID Partition, and you must also install the OS X installer. Apple does not recommend booting your Mac from an external storage drive since you could end up with an earlier version of OS X than the one you were using.

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