“The discovery, made by an AppleInsider source, appears in a configuration plist file used by Boot Camp Assistant to designate the Mac model versions capable of supporting either a optical boot disc, or alternatively, a USB flash drive volume capable of installing Windows to a Boot Camp partition,” Dilger reports. “While all modern Macs can boot OS X from a USB drive, Apple’s Boot Camp Assistant references the plist to display a listing of newer Mac models with EFI-level support for booting a legacy operating system from a USB flash drive. The primary advantage to using a USB flash drive to create a bootable Windows 7 volume from an ISO (disc image file) is if you lack an optical drive burner.”
Dilger reports, “The appearance of new Mac Pro and iMac models in the USB booting support list doesn’t definitively mean the models won’t have optical drives, as it also lists MacBook and MacBook Pro models that do incorporate an optical drive. At the same time, Apple has clearly indicated in the newest Mac mini and Retina Display MacBook Pro that it plans to get rid of optical disc drives as soon as possible across the board, providing an external USB drive as an option for users who need one.”
Much more in the full article here.