Most modern creation tools (like the Media Creation Tool) format the USB drive as MBR with a FAT32 partition. Why? Because almost every modern computer (UEFI) can read MBR/FAT32 for backward compatibility, and older BIOS computers can read it too. It is the "universal donor" format.
The format was silent and swift. In seconds, the drive was wiped clean—a blank slate. Then the tool began to write. A green progress bar crept from 0% to 100% over thirty minutes. Leo watched the laptop’s fan spin up, the drive’s little LED flickering like a heartbeat. It wasn’t just copying files. It was partitioning, making the drive bootable, embedding a master boot record, and laying down the skeleton of an operating system. windows 10 install for usb
He plugged in the blue USB. A notification pinged: “F: Drive (SanDisk Ultra).” Most modern creation tools (like the Media Creation
Older computers or those with CSM enabled will boot the USB drive in "Legacy Mode." It is the "universal donor" format