Nov 11, 2019 To overcome these limitations of the installer for OS X or macOS, all you need is a USB drive that contains a bootable copy of the installer. Lifewire / Alex Diaz Dos How to Create a Bootable Flash Installer of the OSX or MacOS on a USB Drive. I have just purchased a 15' Macbook Pro w/ Retina and I decided to do a clean re-install of OS X 10.8.3. After I created a bootable USB drive I entered the Disk Utility program and say this extra disk at the bottom named OS X Base System. Aug 02, 2011 7) Click Restore – 25 minutes later – One bootable USB drive. Your bootable USB drive will be called “Mac OS X Base System” after the restore is complete. Now to boot from it just select it as the Start Up disk in System Preferences or hold down option key on boot and select it from the choice of bootable devices. BaseSystem.dmg has a volume named 'Mac OS X Base System'. So that's disk0 and disk1; what about the rest? I'm not certain, but I'm pretty sure they are RAM disks to save temporary data in folders OS X modifies as it runs (remember that in recovery mode, you're running from a read-only disk image). I would like to make a bootable DMG or ISO file with OS X Mavericks on it. I want to then burn this file to a DVD-ROM (or, alternatively, make a bootable USB stick with it). From what I've read, h. In such cases, you can use TransMac to burn the DMG file for Mac OS X (whatever version you want to install on your broken Mac) to a USB drive and do the installation that way. To install Mac OS X, you're going to need a USB with at least 16 GB of free space.
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