A boot disk is a floppy disk that contains, at the very least, an operating system. Boot disks are useful in case of a hard drive failure. With a boot disk, you can place a floppy disk in your computer when it boots up and still have access to your computer.

While I highly recommend putting more than just the basic operating system on a boot disk, such as useful batch files, useful commands, device drivers, etc., the following line *will* make a floppy disk bootable:

SYS C: A:

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