Some enclosures offer both Firewire (or Thunderbolt) and USB connectivity, but only one of the interfaces works for booting a Mac. Some Macs can only boot from a particular USB 3.0 enclosure if it is connected to the Mac via a USB 2.0 cable. Macs that did not ship with native support for USB 3.0, for example, may have difficulty booting from a USB 3.0 device. The interface that is used to connect the hard drive enclosure to your Mac also has an effect on bootability. Be sure to check that the manufacturer or vendor supports booting a Mac with the enclosure. ![]() When you buy a hard drive enclosure that you intend to use to boot your Mac, caveat emptor - not all enclosures will boot a Mac (or any machine for that matter). The cloned operating system must be properly "blessed".The cloned filesystem must have all the required components of macOS.The computer must support booting from the hard drive's partition format (e.g.The computer must support booting from the interface used to attach the hard drive (e.g.The hard drive enclosure must support booting a Macintosh (applies to external hard drives only). ![]() ![]() Bootability comes down to a few simple rules:
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