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#Mac os x usb bootable install(Though has a nice set of instructions as well.) I had a copy of the Lion installer, mounted the ESD disk image and then restored it to the USB drive install partition. #Mac os x usb bootable mac os xI basically followed the instructions from OSX Daily page: Make a Bootable Mac OS X 10.7 Lion Installer from a USB Flash Drive. Create the OS X Installer on the Install partition.My theory on the Installer sizing being that amount should be large enough to future-proof that partition for newer DVD-sized OS installers. I partitioned the drive into two partitions–the first for ~28GB for the bootable OS (Utility) and the other at 4.7GB for the installer (Install). I formatted the drive using Disk Utility as Mac OS X Extended (Journaled) and with a “GUID Partition Table”. As of mid-2011 it’s supposed to be one of the faster USB 2.0 drives. I used a Transcend JetFlash 600 – 32 GB USB 2.0 Flash Drive TS32GJF600 (Black). #Mac os x usb bootable fullI ended up going with a 32GB drive–a full OS install takes 14+GB, plus space for extra utilties and the OS installer is described as being 4GB but it’s really a bit larger. So a full bootable copy of OS X, with it’s normal utilities, plus space for additional tools for utilities like Drive Genius and Data Rescue. With Mac OS X 10.7 coming as a digital download (and hence no install DVD), it seemed like as good a time as any to try making a bootable USB drive to use in case of emergency. And then I copy over as well as install various additional utilities. I did this from a second copy of the macOS installer. I Install macOS onto the Utility partition. Then I create a bootable Utility drive.I run DiskMakerX and install macOS 10.12 on the first partition on the USB drive.And I download the latest copy of the DiskMakerX 10.12 utility.While doing all of the above I download the macOS 10.12 installer.I set the first partition as 12GB for the installer (more than is needed), and then the rest for the Utility partition. Then reformat the drive as “Mac OS X Extended (Journaled)” and with a “GUID Partition Table”. Using Disk Utility, format the drive as ExFat. ![]()
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