Starting from Snow Leopard all the way to the newly released macOS 10.15 Catalina.

Once done this USB thumb drive will prove invaluable to you.

Mind you, this will take a while, so grab some coffee, put on some of your favorite music tracks, put on some headphones, sit back and relax while doing this.

Also, since many Macs include SD card readers, a large capacity SD card could be used instead of a USB drive as well.

I suggest naming each partition with the OS X version that will occupy the space to make it easier to identify later.

This reveals the contents of the installer itself and makes navigating the structure possible.

Next, click the Image button next to Source and point to the InstallESD.dmg file recently copied to the desktop.

Next, drag-and-drop the partition created on the USB to the text box next to Destination.

Youll be prompted to confirm that the process will erase the contents of the partition by clicking Erase.

However, once its completed, the partition will be ready to be used to install OS X.

Simply repeat the steps in this section to create an installer for 10.7 and 10.8.

For this process, either the original DVD media or ISODMG images of the DVD are required.

However once its completed, the partition will be ready to be used to install OS X.

Simply repeat the steps in this section to create an installer for 10.4, 10.5, and 10.6, as needed.

If your installers are stored elsewhere, modify the path accordingly.

Also, Untitled should be changed to reflect the name of the USB partition that youll be copying the installer files to.

If you named it by the version number (10.x) as recommended above, youll use that for the volume name.

However, once its done, the partition will be ready to install OS X.

Would save you from having to type every command, or copy paste.

Drag Dmg File To Usb