Compaq dx6100 HP Business Desktop dx6100 Series Personal Computers Service Ref - Page 23
Save Master Boot, Boot Record
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Setup Utilities and Diagnostics Features Heading Security (continued) 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 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. ✎ Support for specific Computer Setup options may vary depending on the hardware configuration. Service Reference Guide, dx6100 361293-003 2-9