Use these free software to create an exact copy of bootable flash USB drive or Clone one USB drive to another USB. Useful to create multiple copies.

Make a macOS installer with createinstallmedia and install Monterey or another macOS on multiple Macs, do a clean install, or access a faulty Mac.

A macOS Catalina USB install drive is a great tool to have on hand to for quick and easy macOS 10.15 reinstalls. We show you how in this video tutorial.

An 8GB or larger USB flash drive or an 8GB or larger partition on some other kind of external drive. For newer Macs, use a USB 3.0 drive—it makes things significantly faster.

Getting Lion from the App Store is convenient, but if you want a physical copy of the installation, you can easily make your own Lion install DVD or USB drive with Disk Utility. If you want to do ...

An 8GB or larger USB flash drive, or an 8GB or larger partition on some other kind of external drive. The OS X 10.9 Mavericks installer from the Mac App Store in your Applications folder.