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<title>Looking for the Debian Installer ISO Image</title>
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When installing via the <emphasis>hd-media</emphasis> method, there
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will be a moment where you need to find and mount the Debian Installer
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iso image in order to get the rest of the installation files. The
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component <command>iso-scan</command> does exactly this.
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At first, <command>iso-scan</command> automatically mounts all block
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devices (e.g. partitions) which have some known filesystem on them and
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sequentially searches for filenames ending with
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<filename>.iso</filename> (or <filename>.ISO</filename> for that
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matter). Beware that the first attempt scans only files in the root
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directory and in the first level of subdirectories (i.e. it finds
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<filename>/<replaceable>whatever</replaceable>.iso</filename>,
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<filename>/data/<replaceable>whatever</replaceable>.iso</filename>,
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<filename>/data/tmp/<replaceable>whatever</replaceable>.iso</filename>).
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After an iso image has been found, <command>iso-scan</command> checks
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its content to determine if the image is a valid Debian iso image or
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not. In the former case we are done, in the latter
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<command>iso-scan</command> seeks for another image.
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In case the previous attempt to find an installer iso image fails,
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<command>iso-scan</command> will ask you whether you would like to
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perform a more thorough search. This pass doesn't just look into the
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topmost directories, but really traverses whole filesystem.
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If <command>iso-scan</command> does not discover your installer iso
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image, reboot back to your original operating system and check if the
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image is named correctly (ending in <filename>.iso</filename>), if it is
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placed on a filesystem recognizable by &d-i;, and if it is not
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corrupted (verify the checksum). Experienced Unix users could do this
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without rebooting on the second console.