You do not want to burn a DVD or CD when installing a new operating system or running some maintenance tools? Me not, too!
Espacially, when you want to install something large which normally requires an expensive dual layer DVD or even when no DVD drive is available at all, it makes sense to use a USB device. On a Mac, this can be a standard USB stick or an iPod having the appropriate capacity.
Also using a USB device is really fast und produces less noise.
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