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<!-- retain these comments for translator revision tracking -->
<!-- original version: 18647 untranslated -->
<sect1 id="linuxdevices"><title>Linux Devices</title>
<para>
In Linux you have various special files in
<filename>/dev</filename>. These files are called devices files. In
the Unix world accessing hardware is different. There you have a
special file which actually runs a driver which in turn accesses the
hardware. The device file is an interface to the actual system
component. Files under <filename>/dev</filename> also behave
differently than ordinary files. Below are the most important device
files listed.
</para><para>
<informaltable><tgroup cols="2"><tbody>
<row>
<entry><filename>fd0</filename></entry>
<entry>First Floppy Drive</entry>
</row><row>
<entry><filename>fd1</filename></entry>
<entry>Second Floppy Drive</entry>
</row>
</tbody></tgroup></informaltable>
<informaltable><tgroup cols="2"><tbody>
<row>
<entry><filename>hda</filename></entry>
<entry>IDE Hard disk / CD-ROM on the first IDE port (Master)</entry>
</row><row>
<entry><filename>hdb</filename></entry>
<entry>IDE Hard disk / CD-ROM on the first IDE port (Slave)</entry>
</row><row>
<entry><filename>hdc</filename></entry>
<entry>IDE Hard disk / CD-ROM on the second IDE port (Master)</entry>
</row><row>
<entry><filename>hdd</filename></entry>
<entry>IDE Hard disk / CD-ROM on the second IDE port (Slave)</entry>
</row><row>
<entry><filename>hda1</filename></entry>
<entry>First partition of the first IDE hard disk</entry>
</row><row>
<entry><filename>hdd15</filename></entry>
<entry>Fifteenth partition of the fourth IDE hard disk</entry>
</row>
</tbody></tgroup></informaltable>
<informaltable><tgroup cols="2"><tbody>
<row>
<entry><filename>sda</filename></entry>
<entry>SCSI Hard disk with lowest SCSI ID (e.g. 0)</entry>
</row><row>
<entry><filename>sdb</filename></entry>
<entry>SCSI Hard disk with next higher SCSI ID (e.g. 1)</entry>
</row><row>
<entry><filename>sdc</filename></entry>
<entry>SCSI Hard disk with next higher SCSI ID (e.g. 2)</entry>
</row><row>
<entry><filename>sda1</filename></entry>
<entry>First partition of the first SCSI hard disk</entry>
</row><row>
<entry><filename>sdd10</filename></entry>
<entry>Tenth partition of the fourth SCSI hard disk</entry>
</row>
</tbody></tgroup></informaltable>
<informaltable><tgroup cols="2"><tbody>
<row>
<entry><filename>sr0</filename></entry>
<entry>SCSI CD-ROM with the lowest SCSI ID</entry>
</row><row>
<entry><filename>sr1</filename></entry>
<entry>SCSI CD-ROM with the next higher SCSI ID</entry>
</row>
</tbody></tgroup></informaltable>
<informaltable><tgroup cols="2"><tbody>
<row>
<entry><filename>ttyS0</filename></entry>
<entry>Serial port 0, COM1 under MS-DOS</entry>
</row><row>
<entry><filename>ttyS1</filename></entry>
<entry>Serial port 1, COM2 under MS-DOS</entry>
</row><row>
<entry><filename>psaux</filename></entry>
<entry>PS/2 mouse device</entry>
</row><row>
<entry><filename>gpmdata</filename></entry>
<entry>Pseudo device, repeater data from GPM (mouse) daemon</entry>
</row>
</tbody></tgroup></informaltable>
<informaltable><tgroup cols="2"><tbody>
<row>
<entry><filename>cdrom</filename></entry>
<entry>Symbolic link to the CD-ROM drive</entry>
</row><row>
<entry><filename>mouse</filename></entry>
<entry>Symbolic link to the mouse device file</entry>
</row>
</tbody></tgroup></informaltable>
<informaltable><tgroup cols="2"><tbody>
<row>
<entry><filename>null</filename></entry>
<entry>Everything pointed to this device will disappear</entry>
</row><row>
<entry><filename>zero</filename></entry>
<entry>One can endlessly read zeros out of this device</entry>
</row>
</tbody></tgroup></informaltable>
</para>
<sect2>
<title>Setting Up Your Mouse</title>
<para>
The mouse can be used in both the Linux console (with gpm) and the X window
environment. The two uses can be made compatible if the gpm repeater is used
to allow the signal to flow to the X server as shown:
<informalexample><screen>
mouse => /dev/psaux => gpm => /dev/gpmdata -> /dev/mouse => X
/dev/ttyS0 (repeater) (symlink)
/dev/ttyS1
</screen></informalexample>
</para><para>
Set the repeater protocol to be raw (in <filename>/etc/gpm.conf</filename>) while
setting X to the original mouse protocol in <filename>/etc/X11/XF86Config</filename>
or <filename>/etc/X11/XF86Config-4</filename>.
</para><para>
This approach to use gpm even in X has advantages when the mouse is
unplugged inadvertently. Simply restarting gpm with
<informalexample><screen>
user@debian:# /etc/init.d/gpm restart
</screen></informalexample>
will re-connect the mouse in software without restarting X.
</para><para>
If gpm is disabled or not installed with some reason, make sure to set X to
read directly from the mouse device such as /dev/psaux. For details, refer
to the 3-Button Mouse mini-Howto at
<filename>/usr/share/doc/HOWTO/en-txt/mini/3-Button-Mouse.gz</filename>,
<userinput>man gpm</userinput>,
<filename>/usr/share/doc/gpm/FAQ.gz</filename>, and
<ulink url="&url-xfree86;current/mouse.html">README.mouse</ulink>.
</para><para arch="powerpc">
For PowerPC, in <filename>/etc/X11/XF86Config</filename> or
<filename>/etc/X11/XF86Config-4</filename>, set the mouse device to
<userinput>"/dev/input/mice"</userinput>.
</para><para arch="powerpc">
Modern kernels give you the capability to emulate a three-button mouse
when your mouse only has one button. Just add the following lines to
<filename>/etc/sysctl.conf</filename> file.
<informalexample><screen>
# 3-button mouse emulation
# turn on emulation
/dev/mac_hid/mouse_button_emulation = 1
# Send middle mouse button signal with the F11 key
/dev/mac_hid/mouse_button2_keycode = 87
# Send right mouse button signal with the F12 key
/dev/mac_hid/mouse_button3_keycode = 88
# For different keys, use showkey to tell you what the code is.
</screen></informalexample>
</para>
</sect2>
</sect1>
<sect1 id="tasksel-size-list">
<title>Disk Space Needed for Tasks</title>
<para>
The base sarge installation for i386, including all standard packages,
requires 178MB of disk space.
</para><para>
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 the numbers up.
</para><para>
<informalexample><screen>
Task Installed Download Space Needed
Size (MB) Size (MB) To Install (MB)
Desktop 1537 521 2058
Web server 71 21 92
Print server 240 83 323
Mail server 41 12 53
File server 85 34 119
SQL database 108 33 141
</screen></informalexample>
</para>
</sect1>
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