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; 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.