Further, it will copy the principal DOS system files, that is, the DOS-BIOS (IO.SYS or IBMBIO.COM) and the DOS kernel (MSDOS.SYS or IBMDOS.COM) into the root directory of the target.
In addition to its other functions, this process will also copy the fundamental DOS system files, such as the DOS-BIOS (IO.SYS or IBMBIO.COM) and the DOS core (MSDOS.SYS or IBMDOS.COM), into the root directory of the target.