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Before Installing &debian;

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This chapter deals with the preparation for installing Debian before you even boot the installer. This includes backing up your data, gathering information about your hardware, and locating any necessary information.

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Overview of the Installation Process

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First, just a note about re-installations. With Debian, a circumstance that will require a complete re-installation of your system is very rare; perhaps mechanical failure of the hard disk would be the most common case.

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Many common operating systems may require a complete installation to be performed when critical failures take place or for upgrades to new OS versions. Even if a completely new installation isn't required, often the programs you use must be re-installed to operate properly in the new OS.

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Under &debian;, it is much more likely that your OS can be repaired rather than replaced if things go wrong. Upgrades never require a wholesale installation; you can always upgrade in-place. And the programs are almost always compatible with successive OS releases. If a new program version requires newer supporting software, the Debian packaging system ensures that all the necessary software is automatically identified and installed. The point is, much effort has been put into avoiding the need for re-installation, so think of it as your very last option. The installer is <emphasis>not</emphasis> designed to re-install over an existing system.

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Here's a road map for the steps you will take during the installation process.

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Back up any existing data or documents on the hard disk where you plan to install.

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Gather information about your computer and any needed documentation, before starting the installation.

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Create partitionable space for Debian on your hard disk.