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diff --git a/en_US.ISO_8859-1/articles/multi-os/article.sgml b/en_US.ISO_8859-1/articles/multi-os/article.sgml deleted file mode 100644 index e7b1d68d68..0000000000 --- a/en_US.ISO_8859-1/articles/multi-os/article.sgml +++ /dev/null @@ -1,680 +0,0 @@ -<!-- $Id: article.sgml,v 1.1 1997-03-23 16:27:47 jfieber Exp $ --> -<!DOCTYPE BOOK PUBLIC "-//Davenport//DTD DocBook V3.0//EN"> -<book> - -<bookinfo> -<bookbiblio> -<title>Installing and Using FreeBSD With Other Operating Systems</title> - -<authorgroup> -<author> -<firstname>Jay</firstname> -<surname>Richmond</surname> -<affiliation> -<address> -<email>jayrich@in.net</email> -</address> -</affiliation> -</author> -</authorgroup> - -<pubdate>6 August 1996</pubdate> - -<abstract><para>This document discusses how to make FreeBSD coexist -nicely with other popular operating systems such as Linux, MS-DOS, -OS/2, and Windows 95. Special thanks to: Annelise Anderson -<email>andrsn@stanford.edu</email>, Randall Hopper -<email>rhh@ct.picker.com</email>, and Jordan K. Hubbard -<email>jkh@time.cdrom.com</email></para></abstract> - -</bookbiblio> -</bookinfo> - -<chapter> -<title>Overview</title> - -<para>Most people can't fit these operating systems together -comfortably without having a larger hard disk, so special -information on large EIDE drives is included. Because there are so -many combinations of possible operating systems and hard disk -configurations, the <xref linkend="ch5"> section may be of the most use -to you. It contains descriptions of specific working computer setups -that use multiple operating systems.</para> - -<para>This document assumes that you have already made room on your -hard disk for an additional operating system. Any time you -repartition your hard drive, you run the risk of destroying the data -on the original partitions. However, if your hard drive is completely -occupied by DOS, you might find the FIPS utility (included on the -FreeBSD CD-ROM in the <filename>\TOOLS</filename> directory or via -<ulink URL="ftp://ftp.freebsd.org/pub/FreeBSD/tools">ftp</ulink>) -useful. It lets you repartition your hard disk without destroying the -data already on it. There is also a commercial program available -called Partition Magic, which lets you size and delete partitions -without consequence.</para> - -</chapter> - -<chapter id="ch2"> -<title>Overview of Boot Managers</title> - -<para>These are just brief descriptions of some of the different boot -managers you may encounter. Depending on your computer setup, you may -find it useful to use more than one of them on the same -system.</para> - -<variablelist> - -<varlistentry> -<term>Boot Easy</term> - -<listitem> -<para>This is the default boot manager used with FreeBSD. It has the -ability to boot most anything, including BSD, OS/2 (HPFS), Windows 95 -(FAT and FAT32), and Linux. Partitions are selected with the -function keys.</para> -</listitem> -</varlistentry> - -<varlistentry> -<term>OS/2 Boot Manager</term> - -<listitem> -<para>This will boot FAT, HPFS, FFS (FreeBSD), and EXT2 -(Linux). It will also boot FAT32 partitions. Partitions are -selected using arrow keys. The OS/2 Boot Manager is the only one to -use its own separate partition, unlike the others which use the -master boot record (MBR). Therefore, it must be installed below the -1024th cylinder to avoid booting problems. It can boot Linux using -LILO when it is part of the boot sector, not the MBR. Go to <ulink -URL="http://www.ssc.com/linux/howto.html">Linux HOWTOs</ulink> -on the World Wide Web for more information on booting Linux with -OS/2's boot manager.</para> -</listitem> -</varlistentry> - -<varlistentry> -<term>OS-BS</term> - -<listitem> <para>This is an alternative to Boot Easy. It gives you -more control over the booting process, with the ability to set the -default partition to boot and the booting timeout. The beta version -of this programs allows you to boot by selecting the OS with your -arrow keys. It is included on the FreeBSD CD in the -<filename>\TOOLS</filename> directory, and via <ulink -URL="ftp://ftp.freebsd.org/pub/FreeBSD/tools">ftp</ulink>.</para> -</listitem> </varlistentry> - -<varlistentry> -<term>LILO, or LInux LOader</term> - -<listitem> -<para>This is a limited boot manager. Will boot FreeBSD, though some -customization work is required in the LILO configuration file.</para> -</listitem> -</varlistentry> - -</variablelist> - -<note id="fat32"><title>About FAT32</title><para>FAT32 is the replacement to -the FAT filesystem included in Microsoft's OEM SR2 Beta release, -which is expected to utilitized on computers pre-loaded with Windows -95 towards the end of 1996. It converts the normal FAT file system -and allows you to use smaller cluster sizes for larger hard drives. -FAT32 also modifies the traditional FAT boot sector and allocation -table, making it incompatible with some boot managers.</para></note> - -</chapter> - -<chapter id="ch3"> -<title>A Typical Installation</title> - -<para>Let's say I have two large EIDE hard drives, and I want to -install FreeBSD, Linux, and Windows 95 on them.</para> - -<para>Here's how I might do it using these hard disks: -<itemizedlist> - -<listitem> -<para><filename>/dev/wd0</> (first physical hard disk)</para> -</listitem> - -<listitem> -<para><filename>/dev/wd1</> (second hard disk)</para> -</listitem> - -</itemizedlist> -</para> - -<para>Both disks have 1416 cylinders.</para> - -<procedure> - -<step><para>I boot from a MS-DOS or Windows 95 boot disk that -contains the <filename>FDISK.EXE</> utility and make a small 50 meg -primary partition (35-40 for Windows 95, plus a little breathing -room) on the first disk. Also create a larger partition on the -second hard disk for my Windows applications and data.</para></step> - -<step><para>I reboot and install Windows 95 (easier said than done) -on the <filename>C:</> partition.</para> </step> - -<step><para>The next thing I do is install Linux. I'm not sure about -all the distributions of Linux, but slackware includes LILO (see -<xref linkend="ch2">). When I am partitioning out my hard disk with -Linux <command>fdisk</command>, I would put all of Linux on the first -drive (maybe 300 megs for a nice root partition and some swap -space).</para></step> - -<step><para>After I install Linux, and are prompted about installing -LILO, make SURE that I install it on the boot sector of my root -Linux partition, not in the MBR (master boot record).</para></step> - -<step><para>The remaining hard disk space can go to FreeBSD. I also -make sure that my FreeBSD root slice does not go beyond the 1024th -cylinder. (The 1024th cylinder is 528 megs into the disk with our -hypothetical 720MB disks). I will use the rest of the hard drive -(about 270 megs) for the <filename>/usr</> and <filename>/</> slices -if I wish. The rest of the second hard disk (size depends on the -amount of my Windows application/data partition that I created in -step 1 can go to the <filename>/usr/src</> slice and swap -space.</para></step> - -<step><para>When viewed with the Windows 95 <command>fdisk</> utility, my hard drives -should now look something like this: -<screen> ---------------------------------------------------------------------- - - Display Partition Information - -Current fixed disk drive: 1 - -Partition Status Type Volume_Label Mbytes System Usage -C: 1 A PRI DOS 50 FAT** 7% - 2 A Non-DOS (Linux) 300 43% - -Total disk space is 696 Mbytes (1 Mbyte = 1048576 bytes) - -Press Esc to continue - ---------------------------------------------------------------------- - - Display Partition Information - -Current fixed disk drive: 2 - -Partition Status Type Volume_Label Mbytes System Usage -D: 1 A PRI DOS 420 FAT** 60% - -Total disk space is 696 Mbytes (1 Mbyte = 1048576 bytes) - -Press Esc to continue - ---------------------------------------------------------------------- -</screen> -** May say FAT16 or FAT32 if you are using the OEM SR2 update. -See <xref linkend="ch2">).</para></step> - -<step><para>Install FreeBSD. I make sure to boot with my first hard -disk set at <quote>NORMAL</> in the BIOS. If it is not, I'll have -the enter my true disk geometry at boot time (to get this, boot -Windows 95 and consult Microsoft Diagnostics (<filename>MSD.EXE</>), -or check your BIOS) with the parameter <literal>hd0=1416,16,63</> -where <replaceable>1416</> is the number of cylinders on my hard -disk, <replaceable>16</> is the number of heads per track, and -<replaceable>63</> is the number of sectors per track on the -drive.</para></step> - -<step><para>When partitioning out the hard disk, I make sure to install -Boot Easy on the first disk. I don't worry about the second disk, -nothing is booting off of it.</para></step> - -<step><para>When I reboot, Boot Easy should recognize my three -bootable partitions as DOS (Windows 95), Linux, and BSD -(FreeBSD).</para></step> - -</procedure> - -</chapter> - -<chapter id="ch4"> -<title>Special Considerations</title> - -<para>Most operating systems are very picky about where and how they are -placed on the hard disk. Windows 95 and DOS need to be on the first -primary partitiin on the first hard disk. OS/2 is the exception. It -can be installed on the first or second disk in a primary or extended -partition. If you are not sure, keep the beginning of the bootable -partitions below the 1024th cylinder.</para> - -<para>If you install Windows 95 on an existing BSD system, it will -<quote>destroy</> the MBR, and you will have to reinstall your -previous boot manager. Boot Easy can be reinstalled by using the -BOOTINST.EXE utility included in the \TOOLS directory on the CD-ROM, -and via <ulink -URL="ftp://ftp.freebsd.org/pub/FreeBSD/tools">ftp</ulink>. You can -also re-start the installation process and go to the partition -editor. From there, mark the FreeBSD partition as bootable, -select Boot Manager, and then type W to (W)rite out the information -to the MBR. You can now reboot, and Boot Easy should then -recognize Windows 95 as DOS.</para> - -<para>Please keep in mind that OS/2 can read FAT and HPFS partitions, -but not FFS (FreeBSD) or EXT2 (Linux) partitions. Likewise, Windows -95 can only read and write to FAT and FAT32 (see <xref -linkend="ch2">) partitions. FreeBSD can read most file systems, but -currently cannot read HPFS partitions. Linux can read HPFS -partitions, but can't write to them. Recent versions of the Linux -kernel (2.x) can read and write to Windows 95 VFAT partitions (VFAT -is what gives Windows 95 long file names - it's pretty much the same -as FAT). Linux can read and write to most file systems. Got that? -I hope so.</para> - -</chapter> - -<chapter id="ch5"> -<title>Examples</title> - -<para><emphasis>(section needs work, please send your example to -<email>jayrich@in.net</email>)</emphasis>.</para> - -<para>FreeBSD+Win95: If you installed FreeBSD after Windows 95, you -should see <literal>DOS</> on the Boot Easy menu. This is Windows -95. If you installed Windows 95 after FreeBSD, read <xref -linkend="ch4"> above. As long as your hard disk does not have 1024 -cylinders you should not have a problem booting. If one of your -partitions goes beyond the 1024th cylinder however, and you get -messages like <errorname>invalid system disk</> under DOS (Windows 95) -and FreeBSD will not boot, try looking for a setting in your BIOS -called <quote>> 1024 cylinder support</> or <quote>NORMAL/LBA</> -mode. DOS may need LBA (Logical Block Addressing) in order to boot -correctly. If the idea of switching BIOS settings every time you -boot up doesn't appeal to you, you can boot FreeBSD through DOS via -the <filename>FBSDBOOT.EXE</> utility on the CD (It should find your -FreeBSD partition and boot it.)</para> - -<para>FreeBSD+OS/2+Win95: Nothing new here. OS/2's boot manger -can boot all of these operating systems, so that shouldn't be a -problem.</para> - -<para>FreeBSD+Linux: You can also use Boot Easy to boot both operating -systems.</para> - -<para>FreeBSD+Linux+Win95: (see <xref linkend="ch3">)</para> - -</chapter> - -<chapter id="sources"> -<title>Other Sources of Help</title> - -<para>There are many <ulink -URL="http://www.ssc.com/linux/howto.html">Linux HOW-TOs</ulink> that -deal with multiple operating systems on the same hard disk.</para> - -<para>The <ulink -URL="http://sunsite.unc.edu/mdw/HOWTO/mini/Linux+OS2+DOS">Linux+OS/2+DOS -Mini-HOWTO</ulink> offers help on configuring the OS/2 boot -manager. The <ulink -URL="http://www.in.net/~jkatz/win95/Linux-HOWTO.html">Linux-HOWTO</ulink> -is also helpful.</para> - -<para>The <ulink -URL="http://www.dorsai.org/~dcl/publications/NTLDR_Hacking">NT Loader -Hacking Guide</ulink> provides good information on multibooting -Windows NT, '95, and DOS with other operating systems.</para> - -<para>And Hale Landis's "How It Works" document pack contains some good info -on all sorts of disk geometry and booting related topics. Here are a few -links that might help you find it: <ulink URL="ftp://fission.dt.wdc.com/pub/otherdocs/pc_systems/how_it_works/allhiw.zip">ftp://fission.dt.wdc.com/pub/otherdocs/pc_systems/how_it_works/allhiw.zip</ulink>, -<ulink URL="http://www.cs.yorku.ca/People/frank/docs/">http://www.cs.yorku.ca/People/frank/docs/</ulink>.</para> - -<para>Finally, don't overlook FreeBSD's kernel documentation on the booting -procedure, available in the kernel source distribution (it unpacks to -<ulink URL="file:/usr/src/sys/i386/boot/biosboot/README.386BSD">file:/usr/src/sys/i386/boot/biosboot/README.386BSD</ulink>.</para> - -</chapter> - -<chapter> -<title>Technical Details</title> - -<para><emphasis>(Contributed by Randall Hopper, -<email>rhh@ct.picker.com</email>)</emphasis></para> - -<para>This section attempts to give you enough basic information -about your hard disks and the disk booting process so that you can -troubleshoot most problems you might encounter when getting set up to -boot several operating systems. It starts in pretty basic terms, so -you may want to skim down in this section until it begins to look -unfamiliar and then start reading.</para> - - -<sect1> -<title>Disk Primer</title> - -<para>Three fundamental terms are used to describe the location of -data on your hard disk: Cylinders, Heads, and Sectors. It's not -particularly important to know what these terms relate to except to -know that, together, they identify where data is physically on your -disk.</para> - -<para>Your disk has a particular number of cylinders, number of -heads, and number of sectors per cylinder-head (a cylinder-head also -known nown as a track). Collectively this information defines the -"physical disk geometry" for your hard disk. There are typically 512 -bytes per sector, and 63 sectors per track, with the number of -cylinders and heads varying widely from disk to disk. Thus you can -figure the number of bytes of data that'll fit on your own disk by -calculating: <informalexample><para>(# of cylinders) × (# -heads) × (63 sectors/track) × (512 -bytes/sect)</></informalexample> For example, on my 1.6 Gig Western -Digital AC31600 EIDE hard disk,that's: <informalexample><para>(3148 -cyl) × (16 heads) × (63 sectors/track) × (512 -bytes/sect)</para></informalexample></para> - -<para>which is 1,624,670,208 bytes, or around 1.6 Gig.</para> - -<para>You can find out the physical disk geometry (number of -cylinders, heads, and sectors/track counts) for your hard disks using -ATAID or other programs off the net. Your hard disk probably came -with this information as well. Be careful though: if you're using -BIOS LBA (see <xref linkend="limits">), you can't use just any -program to get the physical geometry. This is because many programs -(e.g. <filename>MSD.EXE</> or FreeBSD fdisk) don't identify the -physical disk geometry; they instead report the -<firstterm>translated geometry</> (virtual numbers from using LBA). -Stay tuned for what that means.</para> - -<para>One other useful thing about these terms. Given 3 -numbers—a cylinder number, a head number, and a -sector-within-track number—you identify a specific absolute -sector (a 512 byte block of data) on your disk. Cylinders and Heads -are numbered up from 0, and Sectors are numbered up from 1.</para> - -<para>For those that are interested in more technical details, -information on disk geometry, boot sectors, BIOSes, etc. can be found -all over the net. Query Lycos, Yahoo, etc. for <literal>boot -sector</> or <literal>master boot record</>. Among the useful info -you'll find are Hale Landis's <citetitle>How It Works</> document -pack. See the <xref linkend="sources"> section for a few pointers to -this pack.</para> - -<para>Ok, enough terminology. We're talking about booting -here.</para> - -</sect1> - -<sect1 id="booting"> -<title>The Booting Process</title> - -<para>On the first sector of your disk (Cyl 0, Head 0, Sector 1) -lives the Master Boot Record (MBR). It contains a map of your disk. -It identifies up to 4 <firstterm>partitions</>, each of which is a -contiguous chunk of that disk. FreeBSD calls partitions -<firstterm>slices</> to avoid confusion with it's own partitions, but -we won't do that here. Each partition can contain its own operating -system.</para> - -<para>Each partition entry in the MBR has a <firstterm>Partition -ID</>, a <firstterm>Start Cylinder/Head/Sector</>, and an -<firstterm>End Cylinder/Head/Sector</>. The Partition ID tells what -type of partition it is (what OS) and the Start/End tells where it -is. <xref linkend="tbl-pid"> lists a smattering of some common -Partition IDs.</para> - -<table id="tbl-pid"> -<title>Partition IDs</> -<tgroup cols="2"> -<thead> -<row> -<entry>ID (hex)</entry> -<entry>Description</entry> -</row> -</thead> - -<tbody> -<row> -<entry>01</entry> -<entry>Primary DOS12 (12-bit FAT)</entry> -</row> - -<row> -<entry>04</entry> -<entry>Primary DOS16 (16-bit FAT)</entry> -</row> - -<row> -<entry>05</entry> -<entry>Extended DOS</entry> -</row> - -<row> -<entry>06</entry> -<entry>Primary big DOS (> 32MB)</entry> -</row> - -<row> -<entry>0A</entry> -<entry>OS/2</entry> -</row> - -<row> -<entry>83</entry> -<entry>Linux (EXT2FS)</entry> -</row> - -<row> -<entry>A5</entry> -<entry>FreeBSD, NetBSD, 386BSD (UFS)</entry> -</row> - -</tbody> -</tgroup> -</table> - -<para>Note that not all partitions are bootable (e.g. Extended DOS). -Some are—some aren't. What makes a partition bootable is the -configuration of the <firstterm>Partition Boot Sector</> that exists -at the beginning of each partition.</para> - -<para>When you configure your favorite boot manager, it looks up the entries -in the MBR partition tables of all your hard disks and lets you name the -entries in that list. Then when you boot, the boot manager is invoked by -special code in the Master Boot Sector of the first probed hard disk on -your system. It looks at the MBR partition table entry corresponding to -the partition choice you made, uses the Start Cylinder/Head/Sector -information for that partition, loads up the Partition Boot Sector for that -partition, and gives it control. That Boot Sector for the partition itself -contains enough information to start loading the operating system on that -partition.</para> - -<para>One thing we just brushed past that's important to know. All of your -hard disks have MBRs. However, the one that's important is the one on the -disk that's first probed by the BIOS. If you have only IDE hard disks, its -the first IDE disk (e.g. primary disk on first controller). Similarly for -SCSI only systems. If you have both IDE and SCSI hard disks though, the -IDE disk is typically probed first by the BIOS, so the first IDE disk is -the first probed disk. The boot manager you will install will be hooked into -the MBR on this first probed hard disk that we've just described.</para> - -</sect1> - -<sect1 id="limits"> -<title>Booting Limitations and Warnings</title> - -<para>Now the interesting stuff that you need to watch out for.</para> - -<sect2> -<title>The dreaded 1024 cylinder limit and how BIOS LBA helps</title> - -<para>The first part of the booting process is all done through the -BIOS, (if that's a new term to you, the BIOS is a software chip on -your system motherboard which provides startup code for your -computer). As such, this first part of the process is subject to the -limitations of the BIOS interface.</para> - -<para>The BIOS interface used to read the hard disk during this period -(INT 13H, Subfunction 2) allocates 10 bits to the Cylinder Number, 8 -bits to the Head Number, and 6 bits to the Sector Number. This -restricts users of this interface (i.e. boot managers hooked into -your disk's MBR as well as OS loaders hooked into the Boot Sectors) -to the following limits: -<itemizedlist> -<listitem><para>1024 cylinders, max</para></listitem> -<listitem><para>256 heads , max</para></listitem> -<listitem><para>64 cylinders, max (actually 63, <literal>0</> isn't -available)</para></listitem> -</itemizedlist> -</para> - -<para>Now big hard disks have lots of cylinders but not a lot of -heads, so invariably with big hard disks the number of cylinders is -greater than 1024. Given this and the BIOS interface as is, you -can't boot off just anywhere on your hard disk. The boot code (the -boot manager and the OS loader hooked into all bootable partitions' -Boot Sectors) has to reside below cylinder 1024. In fact, if your -hard disk is typical and has 16 heads, this equates to: -<informalexample> -<para>1024 cyl/disk × 16 heads/disk × 63 sect/(cyl-head) -× 512 bytes/sector</para> -</informalexample> -</para> - -<para>which is around the often-mentioned 528MB limit.</para> - -<para>This is where BIOS LBA (Logical Block Addressing) comes in. BIOS LBA -gives the user of the BIOS API calls access to physical cylinders above -1024 though the BIOS interfaces by redefining a cylinder. That is, it -remaps your cylinders and heads, making it appear through the BIOS as -though the disk has fewer cylinders and more heads than it actually -does. In other words, it takes advantage of the fact that hard disks have -relatively few heads and lots of cylinders by shifting the balance between -number of cylinders and number of heads so that both numbers lie below the -above-mentioned limits (1024 cylinders, 256 heads).</para> - -<para>With BIOS LBA, the hard disk size limitation is virtually -removed (well, pushed up to 8 Gigabytes anyway). If you have an LBA -BIOS, you can put FreeBSD or any OS anywhere you want and not hit the -1024 cylinder limit.</para> - -<para>To use my 1.6 Gig Western Digital as an example again, it's -physical geometry is: -<informalexample> -<para>(3148 cyl, 16 heads, 63 sectors/track, 512 bytes/sector)</para> -</informalexample> -</para> - -<para>However, my BIOS LBA remaps this to: -<informalexample> -<para>( 787 cyl, 64 heads, 63 sectors/track, 512 bytes/sector)</para> -</informalexample> -</para> - -<para>giving the same effective size disk, but with cylinder and head -counts within the BIOS API's range (Incidentally, I have both Linux and -FreeBSD existing on one of my hard disks above the 1024th physical -cylinder, and both operating systems boot fine, thanks to BIOS LBA).</para> - -</sect2> - -<sect2> -<title>Boot Managers and Disk Allocation</title> - -<para>Another gotcha to watch out when installing boot managers is -allocating space for your boot manager. It's best to be aware of -this issue up front to save yourself from having to reinstall one or -more of your OSs.</para> - -<para>If you followed the discussion in <xref linkend="booting"> -about the Master Boot Sector (where the MBR is), Partition Boot -Sectors, and the booting process, you may have been wondering just -exactly where on your hard disk that nifty boot manager is going to -live. Well, some boot managers are small enough to fit entirely -within the Master Boot Sector (Cylinder 0, Head 0, Sector 0) along -with the partition table. Others need a bit more room and actually -extend a few sectors past the Master Boot Sector in the Cylinder 0 -Head 0 track, since that's typically free…typically.</para> - -<para>That's the catch. Some operating systems (FreeBSD included) let -you start their partitions right after the Master Boot Sector at -Cylinder 0, Head 0, Sector 2 if you want. In fact, if you give -FreeBSD's sysinstall a disk with an empty chunk up front or the whole -disk empty, that's where it'll start the FreeBSD partition by default -(at least it did when I fell into this trap). Then when you go to -install your boot manager, if it's one that occupies a few extra -sectors after the MBR, it'll overwrite the front of the first -partition's data. In the case of FreeBSD, this overwrites the -disk label, and renders your FreeBSD partition unbootable.</para> - -<para>The easy way to avoid this problem (and leave yourself the -flexibility to try different boot managers later) is just to always -leave the first full track on your disk unallocated when you -partition your disk. That is, leave the space from Cylinder 0, Head -0, Sector 2 through Cylinder 0, Head 0, Sector 63 unallocated, and -start your first partition at Cylinder 0, Head 1, Sector 1. -For what it's worth, when you create a DOS partition at the -front of your disk, DOS leaves this space open by default (this is -why some boot managers assume it's free). So creating a DOS -partition up at the front of your disk avoids this problem -altogether. I like to do this myself, creating 1 Meg DOS partition -up front, because it also avoids my primary DOS drive letters -shifting later when I repartition.</para> - -<para>For reference, the following boot managers use the -Master Boot Sector to store their code and data: -<itemizedlist> - -<listitem> -<para>OS-BS 1.35</para> -</listitem> - -<listitem> -<para>Boot Easy</para> -</listitem> - -<listitem> -<para>LILO</para> -</listitem> - -</itemizedlist> -</para> - -<para>These boot managers use a few additional sectors after the -Master Boot Sector: -<itemizedlist> - -<listitem> -<para>OS-BS 2.0 Beta 8 (sectors 2-5)</para> -</listitem> - -<listitem> -<para>OS/2's boot manager</para> -</listitem> - -</itemizedlist> -</para> - -</sect2> - -<sect2> -<title>What if your machine won't boot?</title> - -<para>At some point when installing boot managers, you might leave the -MBR in a state such that your machine won't boot. This is unlikely, -but possible when re-FDISKing underneath an already-installed boot -manager.</para> - -<para>If you have a bootable DOS partition on your disk, you can boot -off a DOS floppy, and run: -<informalexample> -<screen>A:\> <userinput>FDISK /MBR</></screen> -</informalexample> -</para> - -<para>to put the original, simple DOS boot code back into the system. You can -then boot DOS (and DOS only) off the hard drive. Alternatively, just -re-run your boot manager installation program off a bootable floppy.</para> - -</sect2> -</sect1> -</chapter> -</book> |