SYS

Normally the operating system files that allow a hard disk to be booted are placed at the front of the disk at the time that the boot volume is high-level formatted, using the FORMAT command (with the /S parameter). It is also possible, however, to "convert" an existing disk so that it is bootable, by using the SYS command. SYS copies the operating system files from the volume that the system was booted with (hard disk or floppy) to the target volume.

SYS is normally used to create bootable floppy disks from non-bootable disks. It is also sometimes used to upgrade DOS versions on hard disks; you boot the floppy of the new DOS version and then SYS the new operating system files to the hard disk. (Newer operating systems like Windows 95 take care of this sort of work internally, and don't require this sort of manual operation).

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