A USB 3.0 drive will make things significantly faster, but an older USB 2.0 drive will work in a pinch 8GB drives worked for Mojave and older versions of macOS, but the Catalina installer is just a little too large to fit. A 16GB or larger USB flash drive or a 16GB or larger partition on some other kind of external drive.We've created a USB stick from both Mojave and Catalina, but your experience with other versions may vary. A Mac that you have administrator access to.
Luckily, it's not hard to make one-either with a handy graphical user interface or some light Terminal use.
Further Reading macOS 10.15 Catalina: The Ars Technica reviewĪpple hasn’t shipped operating systems on physical media in a full decade, but there are still good reasons to want a reliable old USB stick for macOS Catalina.
