: The specific section of the USB drive containing the bootloader files (often a FAT32 partition). Common Uses & Troubleshooting Installing Windows/Linux : If you have created a bootable USB using tools like the Windows Media Creation Tool
This number is often the most confusing part for users. It is not the storage capacity (5GB), nor is it the USB standard version (like USB 2.0 or 3.0).
It most commonly appears when you have inserted a bootable USB drive (e.g., Windows installer, Linux live USB, or recovery tool) into your machine.