Partitioning your disk simply refers to the act of breaking up your disk into sections. Each section is then independent of the others. It's roughly equivalent to putting up walls inside a house; if you add furniture to one room it doesn't affect any other room.
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.
In general, changing a partition with a file system already on it will destroy any information there. Thus you should always make backups before doing any repartitioning. Using the analogy of the house, you would probably want to move all the furniture out of the way before moving a wall or you risk destroying it.
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
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.
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.
You can recover from these actions or avoid them, but installing the native system first saves you trouble.
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.
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.
Remember to create a placeholder partition for GNU/Linux, preferably positioned first in the disk layout. it doesn't matter what type it is, it will be deleted and replaced later inside the Debian GNU/Linux installer.
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.