Quote:
Originally Posted by jggimi
The ramdisk kernel (bsd.rd) functions without mounting any physical drives. This is why it's called the "ramdisk kernel". Using it, an admin can reinstall or upgrade, including an upgrade-in-place of the installed system, which replaces boot blocks, kernels, and userland libraries and executables (/bin, /sbin, /usr/bin, /usr/lib, /usr/sbin, /usr/libexec, and I'm sure a few other structures I've forgotten).
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Also of note is
/usr/mdec/mbr which is a copy of the
master boot record constructed at installation. If you have concerns about the presence of boot sector infection, you can always
diff(1) the boot sector against this file.
CyberJet, you will find useful information in the
boot_i386(8) manpage, &
Section 14.7 of the FAQ.