Hack 53 Restore DOS Bootability 
Make your drive bootable to get a DOS or
Windows 9x-Me drive back up and running quickly.
Just
as the FDISK /MBR command [Hack #47] can rebuild the lost boot
information from the beginning of a hard drive, a little
command-prompt program named SYS.COM can help you take that
bootability to where it needs to be—containing the operating
system files to get the system started. If you've
got a nonbootable drive for DOS or Windows 9x-Me that is missing
either the IO.SYS, MSDOS.SYS, or COMMAND.COM DOS files, start your
fix with FDISK /MBR. Boot from a startup
diskette for the operating system you need to repair and then
execute:
SYS C:
SYS copies the basic operating system files—IO.SYS, MSDOS.SYS,
and COMMAND.COM—from the diskette to the drive letter
designated: in this case, drive C:. Remove the diskette from the
drive and restart the system from the hard drive.
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