I am trying to install macOS 10.15 Catalina on an unsupported Mac using dosdude1.com’s Catalina Patcher. I have a SanDisk Cruzer 16GB USB-stick plugged in. I have just reformatted it as per dosdude1.com’s instruction video. But when try to install the Catalina Installer onto it, I get an error saying that the selected media is not large enough because it needs at least 10GB of free space.
The USB-stick is 16GB so that shouldn’t be a problem. What can I do ?
Some versions of Disk Utility seem to have trouble (re)formatting disk volumes. Could it be you tried this with Disk Utility on a macOS 10.13 High_Sierra Mac ?
The solution is rather simple: format the USB-stick from Disk Utility on a different Mac that runs another version of macOS (preferably an older version of MacOSX / OSX). Make sure you (re)format the USB-stick as “Master Boot Record” in “HFS+ Case-sensitive (Journaled)” (a.k.a. “Mac OS Extended”) format.
Then retry in Catalina Patcher.
That’s it !