Here are the methods to create a bootable USB drive on Mac. There are a few general guidelines that can help get your machine started which are mentioned above, regardless of the OS the user prefers. How to Create Bootable USB on Mac.
![]() Create A Bootable Usb Book Pro From An I Manual Page ForIt also avoids the need of downloading commercial software from the internet. You can’t set this to be the default boot with System Integrity Protection but for this use, bless should still work.It's not that hard to make a bootable image and far more secure to DIY. (Note - the manual page for bless may be moved, but the command still works on Mojave to bless an alternate boot. Before restoring an IMG to the USB drive.2) bless the USB drive by selecting it in Startup Disk or using the command line.DaisyDisk or WhatSize will show you all the large files and libraries. At the end of the process, you then thin out the things you don't need. You can have your USB on one side and the USB install disk on the other to make your bootable drive ensuring all the Air drivers are on your USB bootable drive (which is often an issue when using another install's image - sometimes the drivers are not all there on older builds of the OS)The best trick I have when you don't have enough space on USB to create the final updated version is to stage the bootable image by install first to a 25G partition on an external hard drive.You can finish installing with lots of free space on the HS, run all the updates newer than your installer (10.6.8 for example), make an admin account, install the tools and apps you need.$diskutil list3: Apple_HFS Mac OS X Install DVD 6.7 GB disk5s3$diskutil partitionDisk disk6 GPT HFS+ MacUSB 100%Formatting disk6s2 as Mac OS Extended with name MacUSB$sudo asr restore -source /dev/disk5s3 -target /dev/disk6s2 -eraseErase contents of /dev/disk6s2 (/Volumes/MacUSB)? : yRestoring. The man pages for diskutil and asr are helpful if you run into little gotchas or have different needs than a basic one partition drive. I have a Snow Leopard DVD as /dev/disk5 and my USB is /dev/disk6. Leopard was a tight fit in 8G but Snow Leopard is lighter and doesn't need to diet as much.Edit: Here are terminal commands for rolling your own installer like the (read-only) one that ships with current MacBook Air. Once you have slimmed down the bootable image on the HD partition, use the trick below to get it on the USB drive. WhatSize has many options to strip out unneeded files, localizations and PPC code. ![]() You can use a utility such as Onyx or use the terminal with the open command to mount it. There is a invisible file at the root you need to mount on the desktop called MacOSX.dmg. Insert the Apple USB stick also. Get an 8GB USB stick and format it for a boot disk (partition it with GUID option and (Mac OS X extended (journaled)). Then you could boot off your rescue USB disk and have your data saved on another external drive.Here's a method of at least cloning your boot disk from discussions.apple.com which seems to have worked for several people License key generator for reimageYou can then also use Disk Utility to create a disk image of the new copy.To allow you to view hidden files, in terminal run this command:Defaults write com.apple.Finder AppleShowAllFiles TRUE (hit Enter after each command)Afterwards, to hide hidden files again, go back to Terminal :Defaults write com.apple. After this finishes you will now have a bootable copy. Steps 2 - 4 are necessary because if you just clone the Apple USB stick the new USB stick won't be bootable. Select the delete exiting files. Use carbon copy cloner to then clone the Apple USB stick to the new USB stick.
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