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110 lines
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<!Converted with LaTeX2HTML 95.1 (Fri Jan 20 1995) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds >
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<TITLE>2.5.2.2 Problems recognizing hard drive or controller</TITLE>
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<meta name="description" value="2.5.2.2 Problems recognizing hard drive or controller">
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<meta name="resource-type" value="document">
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<BR> <HR><A NAME=tex2html2781 HREF="node86.html"><IMG ALIGN=BOTTOM ALT="next" SRC="next_motif.gif"></A> <A NAME=tex2html2779 HREF="node83.html"><IMG ALIGN=BOTTOM ALT="up" SRC="up_motif.gif"></A> <A NAME=tex2html2773 HREF="node84.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif"></A> <A NAME=tex2html2783 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="contents_motif.gif"></A> <A NAME=tex2html2784 HREF="node250.html"><IMG ALIGN=BOTTOM ALT="index" SRC="index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html2782 HREF="node86.html">2.5.2.3 Problems with SCSI </A>
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<B>Up:</B> <A NAME=tex2html2780 HREF="node83.html">2.5.2 Hardware problems</A>
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<B> Previous:</B> <A NAME=tex2html2774 HREF="node84.html">2.5.2.1 Isolating hardware problems</A>
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<BR> <HR> <P>
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<H3><A NAME=SECTION00452200000000000000>2.5.2.2 Problems recognizing hard drive or controller</A></H3>
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<P>
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<A NAME=1618> </A>
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<P>
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When Linux boots, you should see a series of messages on your screen such
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as:
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<P><TT> Console: colour EGA+ 80x25, 8 virtual consoles <BR>
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Serial driver version 3.96 with no serial options enabled <BR>
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tty00 at 0x03f8 (irq = 4) is a 16450 <BR>
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tty03 at 0x02e8 (irq = 3) is a 16550A <BR>
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lp_init: lp1 exists (0), using polling driver <BR>
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...
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<P></TT>
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Here, the kernel is detecting the various hardware devices present on your
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system. At some point, you should see the line
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<P><TT> Partition check:
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<P></TT>
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followed by a list of recognized partitions, for example:
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<P><TT> Partition check: <BR>
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hda: hda1 hda2 <BR>
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hdb: hdb1 hdb2 hdb3
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<P></TT>
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If, for some reason, your drives or partitions are not recognized, then
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you will not be able to access them in any way.
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<P>
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There are several things that can cause this to happen:
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<UL><LI> <b>Hard drive or controller not supported.</b> If you are using a
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hard drive controller (IDE, SCSI, or otherwise) that is not supported by
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Linux, the kernel will not recognize your partitions at boot time.
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<A NAME=1627> </A>
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<P>
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<LI> <b>Drive or controller improperly configured.</b>
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Even if your controller is supported by Linux, it may not be configured
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correctly. (This is particularly a problem for SCSI controllers; most
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non-SCSI controllers should work fine without any additional configuration).
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<P>
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Refer to the documentation for your hard drive and/or controller for
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information on solving these kinds of problems. In particular, many hard
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drives will need to have a jumper set if they are to be used as a ``slave''
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drive (for example, as the second hard drive). The acid test for this
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kind of condition is to boot up MS-DOS, or some other operating system,
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known to work with your drive and controller. If you can access the drive
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and controller from another operating system, then it is not a problem with
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your hardware configuration.
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<P>
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See Section <A HREF="node84.html#secinstallprobshardwareconflicts">2.5.2.1</A>, above, for
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information on resolving possible device conflicts, and
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Section <A HREF="node86.html#secinstallprobshardwarescsi">2.5.2.3</A>, below, for information on
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configuring SCSI devices.
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<P>
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<LI> <b>Controller properly configured, but not detected.</b>
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Some BIOS-less SCSI controllers require the user to specify information about
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the controller at boot time.
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Section <A HREF="node86.html#secinstallprobshardwarescsi">2.5.2.3</A>, below, describes how to
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force hardware detection for these controllers.
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<P>
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<LI> <b>Hard drive geometry not recognized.</b> Some systems, such as
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the IBM PS/ValuePoint, do not store hard drive geometry information in
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the CMOS memory, where Linux expects to find it. Also, certain SCSI
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controllers need to be told where to find drive geometry in order for
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Linux to recognize the layout of your drive.
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<P>
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Most distributions provide a bootup option to specify the
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drive geometry. In general, when booting the installation
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media, you can specify the drive geometry at the LILO boot prompt with
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a command such as:
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<P><TT> boot: <em>linux hd=<IMG BORDER=0 ALIGN=BOTTOM ALT="" SRC="img72.gif">,<IMG BORDER=0 ALIGN=BOTTOM ALT="" SRC="img73.gif">,<IMG BORDER=0 ALIGN=BOTTOM ALT="" SRC="img74.gif"></em>
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<P></TT>
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where <IMG BORDER=0 ALIGN=BOTTOM ALT="" SRC="img75.gif">, <IMG BORDER=0 ALIGN=BOTTOM ALT="" SRC="img76.gif">, and <IMG BORDER=0 ALIGN=BOTTOM ALT="" SRC="img77.gif"> correspond
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to the number of cylinders, heads, and sectors per track for your hard
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drive.
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<P>
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After installing the Linux software, you will be able to install LILO,
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allowing you to boot from the hard drive. At that time, you can specify the
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drive geometry to the LILO installation procedure, making it unnecessary to
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enter the drive geometry each time you boot. See Chapter <A HREF="node155.html#chapsysadmnum">4</A>
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for more about LILO.
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<P>
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</UL>
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<P>
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<A NAME=1644> </A>
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<P>
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<BR> <HR><A NAME=tex2html2781 HREF="node86.html"><IMG ALIGN=BOTTOM ALT="next" SRC="next_motif.gif"></A> <A NAME=tex2html2779 HREF="node83.html"><IMG ALIGN=BOTTOM ALT="up" SRC="up_motif.gif"></A> <A NAME=tex2html2773 HREF="node84.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif"></A> <A NAME=tex2html2783 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="contents_motif.gif"></A> <A NAME=tex2html2784 HREF="node250.html"><IMG ALIGN=BOTTOM ALT="index" SRC="index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html2782 HREF="node86.html">2.5.2.3 Problems with SCSI </A>
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<B>Up:</B> <A NAME=tex2html2780 HREF="node83.html">2.5.2 Hardware problems</A>
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<B> Previous:</B> <A NAME=tex2html2774 HREF="node84.html">2.5.2.1 Isolating hardware problems</A>
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<BR> <HR> <P>
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<BR> <HR>
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<P><ADDRESS>
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<I>Matt Welsh <BR>
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mdw@sunsite.unc.edu</I>
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</ADDRESS>
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</BODY>
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