Since the release of OS X Lion, Apple has provided Mac users with a separate, hidden volume known as OS X Recovery. Having an external hard drive loaded up with the installers of different versions of OS X, as well as a known-working installation of OS X, can be used to perform almost any troubleshooting task you may need by bypassing any potential software issue that the Mac is suffering from.Īn external hard drive used in this manner is commonly referred to as a Triage Drive. By holding down the Alt key during boot, the Mac will display all available volumes that it can boot from.
Luckily, the Mac can boot from almost any type of external storage device, in addition to its internal hard drive, via USB, Thunderbolt or FireWire.
Some of these reasons, in no particular order, include: There can be many reasons why a Mac can no longer boot correctly and it's usually software-related. Serving as an epilogue to our series Disk Management from the Command-Line, we'll explore how to build an external boot drive and automate the process if multiple drives are needed. Whether you're trying to troubleshoot a failed software update or need to install Mavericks onto hundreds of Macs, an external hard drive loaded with OS X can be just what you need to perform whatever software task might be needed. An external hard drive containing a bootable copy of OS X is probably the most important tool for any Mac technician to have.
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