HP Compaq dx6100 MT Reference Manual page 23

Heading Option
Security Master Boot
Record Security*
(continued)
Save Master Boot
Record*
Restore Master
Boot Record*
✎
Support for specific Computer Setup options may vary depending on the hardware configuration.
Service Reference Guide, dx6100
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 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.
✎
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.
✎
Only appears if MBR Security is enabled.
Restores the backup Master Boot Record to the current bootable
disk.
✎
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.
Ä CAUTION: Restoring a previously saved MBR after a disk utility
or operating system has modified the MBR may cause the data on
the disk to become inaccessible. Only restore a previously saved
MBR ifyou are confident that the current bootable disk's MBR has
been corrupted or infected with a virus.
361293-003
Setup Utilities and Diagnostics Features
Description
2–9