Leopard was a tight fit in 8G but Snow Leopard is lighter and doesn't need to diet as much.Įdit: 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 safely get rid of a lot of iLife and the associated Application Support. 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 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. 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 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) If you simply want a bootable thumb drive, just install OSX onto that volume - turning off all the extras you may not need. It also avoids the need of downloading commercial software from the internet. It's not that hard to make a bootable image and far more secure to DIY.
You can’t set this to be the default boot with System Integrity Protection but for this use, bless should still work. (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.Ģ) bless the USB drive by selecting it in Startup Disk or using the command line. Watch for restore errors - you may need the Disk Utility menu command Images -> Scan images for restore. I usually first create a IMG of the DVD, but it should work in one shot. (Migration Assistant, Disk Utility, Network Utility, Terminal (that auto mounts your internal drive as needed), Firmware Utility and Password Reset Utility.ġ) Use Disk Utility backup/restore to image whatever Snow Leopard DVD you prefer onto a HFS+ formatted GUID USB drive. Really - try the above if you can, but as an alternative, here is a simple recipe for making a USB version of the OS X installer + associated tools. With OS X El Capitan, Yosemite, or Mavericks, you can use a USB flash drive or other removable media as a startup disk from which to install OS X. - Create a bootable installer for OS X.
If Apple's supported method of using the createinstallmedia tool doesn't work, you can try other options below:
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