A bootdisk is basically a miniature, self-contained Linux system on a diskette. It must perform many of the same functions that a complete full-size Linux system performs.

What does a boot disk do?

A boot disk is a removable digital data storage medium from which a computer can load and run (boot) an operating system or utility program. The computer must have a built-in program which will load and execute a program from a boot disk meeting certain standards.

What is booting in Linux?

The boot sequence starts when the computer is turned on, and is completed when the kernel is initialized and systemd is launched. The startup process then takes over and finishes the task of getting the Linux computer into an operational state.