Hack 47 Fix the Master Boot Record on FAT Partitions 
Use FDISK to restore the ability to boot from
your FAT-16 or FAT-32 hard drive.
FDISK is a
DOS program that can actually
help you out of some of those nasty "unable to
locate operating system" and "no
boot drive available" error conditions
Windows 9x and DOS users encounter
from time to time. The Master Boot Record can be corrupted by an
improper shutdown, power glitch, or disk failure. Re-creating a new
Master Boot Record at the first sector of the hard drive—which
is what your system BIOS is looking for in order to turn over the
startup operation to an operating system—is an easy fix.
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If your hard drive is managed by a drive overlay utility from OnTrack
or a specific program provided by your drive manufacturer (as
indicated by a Disk Manager or similar announcement message during
bootup) or is set to boot with the GRUB or LILO boot managers, or
into Linux, using this hack will destroy access to the drive.
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To use FDISK's Master Boot Record restoration
feature to get your main or additional drives back into bootable
shape, follow these steps:
Boot with a DOS diskette, boot CD, or bootable USB FLASH drive or
hard drive containing DOS and FDISK. A Windows 98 or Me startup
diskette will do nicely. At the command prompt type in either: FDISK /MBR
or FDISK /CMBR
x
Remove the disk or device you booted to DOS with and then restart the
system to verify that you can boot from the hard drive.
FDISK /MBR re-creates the Master Boot Record, the
first sector of the hard disk. This can be helpful to repair a
damaged or corrupted bootable drive.
FDISK /CMBR x
re-creates the boot sector of the first (x
= 1), second (x = 2), third
(x = 3), or fourth
(x = 4) hard disk(s).
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