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3.

In Linux various special files can be found under the directory <filename>/dev</filename>. These files are called device files and behave unlike ordinary files. The most common types of device files are for block devices and character devices. These files are an interface to the actual driver (part of the Linux kernel) which in turn accesses the hardware. Another, less common, type of device file is the named <firstterm>pipe</firstterm>. The most important device files are listed in the tables below.

51.

The mouse can be used in both the Linux console (with gpm) and the X window environment. Normally, this is a simple matter of installing <filename>gpm</filename> and the X server itself. Both should be configured to use <filename>/dev/input/mice</filename> as the mouse device. The correct mouse protocol is named <userinput>exps2</userinput> in gpm, and <userinput>ExplorerPS/2</userinput> in X. The respective configuration files are <filename>/etc/gpm.conf</filename> and <filename>/etc/X11/xorg.conf</filename>.

52.

Certain kernel modules must be loaded in order for your mouse to work. In most cases the correct modules are autodetected, but not always for old-style serial and bus mice<footnote> <para> Serial mice usually have a 9-hole D-shaped connector; bus mice have an 8-pin round connector, not to be confused with the 6-pin round connector of a PS/2 mouse or the 4-pin round connector of an ADB mouse. </para> </footnote>, which are quite rare except on very old computers. Summary of Linux kernel modules needed for different mouse types: <informaltable><tgroup cols="2"><thead> <row> <entry>Module</entry> <entry>Description</entry> </row> </thead><tbody> <row> <entry>psmouse</entry> <entry>PS/2 mice (should be autodetected)</entry> </row> <row> <entry>usbhid</entry> <entry>USB mice (should be autodetected)</entry> </row> <row> <entry>sermouse</entry> <entry>Most serial mice</entry> </row> <row> <entry>logibm</entry> <entry>Bus mouse connected to Logitech adapter card</entry> </row> <row> <entry>inport</entry> <entry>Bus mouse connected to ATI or Microsoft InPort card</entry> </row> </tbody></tgroup></informaltable> To load a mouse driver module, you can use the <command>modconf</command> command (from the package with the same name) and look in the category <userinput>kernel/drivers/input/mouse</userinput>.

56.

A standard installation for the i386 architecture, including all standard packages and using the default 2.6 kernel, takes up &std-system-size;MB of disk space. A minimal base installation, without the <quote>Standard system</quote> task selected, will take &base-system-size;MB.

57.

In both cases this is the actual disk space used <emphasis>after</emphasis> the installation is finished and any temporary files deleted. It also does not take into account overhead used by the file system, for example for journal files. This means that significantly more disk space is needed both <emphasis>during</emphasis> the installation and for normal system use.

58.

The following table lists sizes reported by aptitude for the tasks listed in tasksel. Note that some tasks have overlapping constituents, so the total installed size for two tasks together may be less than the total obtained by adding up the numbers.

59.

Note that you will need to add the sizes listed in the table to the size of the standard installation when determining the size of partitions. Most of the size listed as <quote>Installed size</quote> will end up in <filename>/usr</filename> and in <filename>/lib</filename>; the size listed as <quote>Download size</quote> is (temporarily) required in <filename>/var</filename>.

100.

This section explains how to install &debian; from an existing Unix or Linux system, without using the menu-driven installer as explained in the rest of the manual. This <quote>cross-install</quote> HOWTO has been requested by users switching to &debian; from Red Hat, Mandrake, and SUSE. In this section some familiarity with entering *nix commands and navigating the file system is assumed. In this section, <prompt>$</prompt> symbolizes a command to be entered in the user's current system, while <prompt>#</prompt> refers to a command entered in the Debian chroot.

101.

Once you've got the new Debian system configured to your preference, you can migrate your existing user data (if any) to it, and keep on rolling. This is therefore a <quote>zero downtime</quote> &debian; install. It's also a clever way for dealing with hardware that otherwise doesn't play friendly with various boot or installation media.

102.

As this is a mostly manual procedure, you should bear in mind that you will need to do a lot of basic configuration of the system yourself, which will also require more knowledge of Debian and of Linux in general than performing a regular installation. You cannot expect this procedure to result in a system that is identical to a system from a regular installation. You should also keep in mind that this procedure only gives the basic steps to set up a system. Additional installation and/or configuration steps may be needed.