3.5. マルチブートシステムでの事前パーティション分割

「ディスクのパーティション分割」とは、ディスクをセクションに分けることです。各セクションは他のセクションから独立しています。この作業は要するに、家の中に壁を作るようなものです。ある部屋に家具を入れても、それは他の部屋には影響しないというわけです。

If you already have an operating system on your system which uses the whole disk and you want to stick Debian on the same disk, you will need to repartition it. Debian requires its own hard disk partitions. It cannot be installed on Windows or Mac OS X partitions. It may be able to share some partitions with other Unix systems, but that's not covered here. At the very least you will need a dedicated partition for the Debian root filesystem.

You can find information about your current partition setup by using a partitioning tool for your current operating system, such as Disk Utility, Drive Setup, HD Toolkit, or MacTools. Partitioning tools always provide a way to show existing partitions without making changes.

一般に、既にファイルシステムの入っているパーティションを変更すると、中の情報はすべて破壊されてしまいます。そのため、パーティション分割をやり直す前には、必ずバックアップを取っておいてください。家の例でいうと、壁を動かす前には、家具が壊れないよう、あらかじめどかしておきます。

Several modern operating systems offer the ability to move and resize certain existing partitions without destroying their contents. This allows making space for additional partitions without losing existing data. Even though this works quite well in most cases, making changes to the partitioning of a disk is an inherently dangerous action and should only be done after having made a full backup of all data.

Creating and deleting partitions can be done from within debian-installer as well as from an existing operating system. As a rule of thumb, partitions should be created by the system for which they are to be used, i.e. partitions to be used by Debian GNU/Linux should be created from within debian-installer and partitions to be used from another operating system should be created from there. debian-installer is capable of creating non-Linux partitions, and partitions created this way usually work without problems when used in other operating systems, but there are a few rare corner cases in which this could cause problems, so if you want to be sure, use the native partitioning tools to create partitions for use by other operating systems.

If you are going to install more than one operating system on the same machine, you should install all other system(s) before proceeding with the Debian installation. Windows and other OS installations may destroy your ability to start Debian, or encourage you to reformat non-native partitions.

このような動作から復旧したり、そのような提案を断ったりすることはできますが、先にそちらのシステムをインストールしておけば、最初からトラブルを避けることができます。

In order for OpenFirmware to automatically boot Debian GNU/Linux the Linux partitions should appear before all other partitions on the disk, especially Mac OS X boot partitions. This should be kept in mind when pre-partitioning; you should create a Linux placeholder partition to come before the other bootable partitions on the disk. (The small partitions dedicated to Apple disk drivers are not bootable.) You can delete the placeholder with the Debian partition tools later during the actual install, and replace it with Linux partitions.

3.5.1. Mac OS X のパーティション分割

The Disk Utility application can be found under the Utilities menu in Mac OS X Installer. It will not adjust existing partitions; it is limited to partitioning the entire disk at once.

GNU/Linux で用いるところに、場所埋め用パーティションを作るのを忘れないでください。できればディスクの先頭に置きましょう。後で Debian GNU/Linux のインストーラから、一度消して置き換えることになりますので、タイプは何でも構いません。

Debian installer partition table editing tools are compatible with OS X, but not with MacOS 9. If you are planning to use both MacOS 9 and OS X, it is best to install OS X and Debian on one hard drive, and put MacOS 9 on a separate hard drive. Separate options for OS 9 and OS X will appear when holding the option key at boot time, and separate options can be installed in the yaboot boot menu as well.

GNU/Linux is unable to access information on UFS partitions, but can access HFS+ (aka MacOS Extended) partitions. OS X requires one of these two types for its boot partition. MacOS 9 can be installed on either HFS (aka MacOS Standard) or HFS+. To share information between the Mac OS X and GNU/Linux systems, an exchange partition is handy. HFS, HFS+ and MS-DOS FAT file systems are supported by MacOS 9, Mac OS X and GNU/Linux.