How to create a bootable USB Drive that will boot on BOTH an Intel Mac and a PC I recently created a bootable USB Thumb Drive containing a Linux Live Distro. I created it on a PC running Windows and tested it successfully on the same PC.
Now I want to run the same Linux OS on my Mac with an Apple T2 Security Chip, using the same Thumb drive.
I booted into Recovery mode to allow booting from an external drive.
After restarting and holding the option key, I got a choice of &quot;Macintosh HD&quot; or &quot;EFI Boot&quot;. I chose &quot;EFI Boot&quot;.

After what looked like a Mac loading bar, I finally got the following message: &quot;Unable to verify startup disk.&quot;

My question is: How can I create a bootable Linux USB drive (read-only, I don't need to persist anything to the drive) that will reliably let me boot it both on my Mac and a PC device ? Do I need a specific Disk Format ? Do I need to create it with a specific software?
In my Mac's Startup Security Utility, I had selecte &quot;Allow booting from external media&quot;, but not &quot;No Security&quot; from the section above called &quot;Secure Boot&quot;. Once I had selected &quot;No Security&quot; as well, I was able to boot from by thumb drive (FAT32).