If you need a PC to be able to use it as well as a mac, then you can use MS-DOS, but there will be a 4GB file limitation with MS-DOS (FAT32).

Just click here to get to it or copy and paste the link below..html.

The file is already on a drive that is formatted either exFAT, NTFS or HFS as its over 4GB already or it wouldnt be there in the first place.

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Itll leave your current configuration intact and allow you to play around with Catalina or try out the beta of macOS Big Sur.

Luckily you can get hold of a USB flash stick pretty cheaply, such as this SanDisk 128GB Flash Drive, which we got on Amazon for 15.89.

Now you will see the root drive in addition to the external volume below it.

You can also find it by using Spotlight (press Command spacebar and start typing the name of the OS).

It will invite you to set up the installation of macOS Catalina (or whatever) click Continue.

Do not click on Home as you dont want to install on your main drive.

This process may take a while - if it tells you it will take 10 minutes its lying.

Best Format For Mac Os X External Drive