TAG MIL-BOOK 10 - Manual (Page 74)

Virus Alert
Gives a warning message when the hard disk boot sector (partition table)
is about to be changed. A check mark indicates enabled, while underline
indicates disabled.
BootSector Protect
Helps prevent infection of computer viruses by protecting the hard disk
boot sector (partition table) from changes. A check mark indicates
enabled, while underline indicates disabled.
CAUTION: Disable this item before installing an operating system, running Fdisk or
Format program. Otherwise, the intended action will fail.
Setup Configuration Utility (SCU) 5-17