Compaq Deskpro ap230 Hardware Reference Manual page 43

Computer Setup
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Security
(continued)
Support for Computer Setup options may vary depending on your specific hardware configuration.
B-10 Computer Setup
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Option
Master Boot Record
Security
Save Master Boot Record
Restore Master Boot
Record
Description
Allows you to enable or disable Master Boot Record
(MBR) Security. When enabled, the BIOS rejects all
requests to write to the MBR on the current bootable
disk. Each time the computer is powered on or
rebooted, the BIOS compares the MBR of the current
bootable disk to the previously-saved MBR. If
changes are detected, you are given the option of
saving the MBR on the current bootable disk,
restoring the previously-saved MBR, or disabling
MBR Security. You must know the setup password, if
one is set.
Note: Disable MBR Security before intentionally
changing the formatting or partitioning of the current
bootable disk. Several disk utilities (such as FDISK
and FORMAT) attempt to update the MBR. If MBR
Security is enabled and disk accesses are being
serviced by the BIOS, write requests to the MBR are
rejected, causing the utilities to report errors. If MBR
Security is enabled and disk accesses are being
serviced by the operating system, any MBR change
will be detected by the BIOS during the next reboot,
and an MBR Security warning message will be
displayed.
Saves a backup copy of the Master Boot Record of
the current bootable disk.
Note: Only appears if MBR Security is enabled.
Restores the backup Master Boot Record to the
current bootable disk.
Note: Only appears if all of the following conditions
are true:
MBR Security is enabled
A backup copy of the MBR has been previously
saved
The current bootable disk is the same disk from
which the backup copy of the MBR was saved
Continued