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Corrected implication that /boot/boot0 comes from MBR.

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Added detail about fdisk and /boot/mbr to head off reader assumption
that FreeBSD's boot manager is FreeBSD-fdisk's default boot manager.

Added detail to statement about 512 byte boot program
to head off debatable claims that it's untrue, and also
to inform the reader.

Approved by:    keramida
This commit is contained in:
Gary W. Swearingen 2005-09-12 15:14:54 +00:00
parent a65d0f5627
commit 3735e320fd
Notes: svn2git 2020-12-08 03:00:23 +00:00 
svn path=/head/; revision=25609
1 changed files with 11 additions and 5 deletions
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16
en_US.ISO8859-1/books/handbook/boot/chapter.sgml
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@ -128,14 +128,20 @@
<title>MBR, <filename>/boot/boot0</filename></title> <title>MBR, <filename>/boot/boot0</filename></title>
<indexterm><primary>Master Boot Record (MBR)</primary></indexterm> <indexterm><primary>Master Boot Record (MBR)</primary></indexterm>
<para>The FreeBSD MBR is located in <filename>/boot/boot0</filename>. <para>The MBR installed by FreeBSD's installer and by boot0cfg(8)
This is a <emphasis>copy</emphasis> of the MBR, as the real MBR must are based on <filename>/boot/boot0</filename>. The MBR is the first
be placed on a special part of the disk, outside the FreeBSD sector of a disk, outside slices. (The MBR installed by fdisk(8),
area.</para> by default, is based on <filename>/boot/mbr</filename>; it is
similar to the PC-DOS MBR and it boots the slice marked
<emphasis>active</emphasis> without prompting the user as the
FreeBSD MBR does.)
<para><filename>boot0</filename> is very simple, since the <para><filename>boot0</filename> is very simple, since the
program in the <abbrev>MBR</abbrev> can only be 512 bytes in program in the <abbrev>MBR</abbrev> can only be 512 bytes in
size. If you have installed the FreeBSD MBR and have installed size.
(Actually, it can only be 446 bytes because of the slice
table and the 0x55AA identifier at the end of the MBR).
If you have installed the FreeBSD MBR and have installed
multiple operating systems on your hard disks then you will see a multiple operating systems on your hard disks then you will see a
display similar to this one at boot time:</para> display similar to this one at boot time:</para>