|Red Hat Enterprise Linux 3: Installation Guide for the x86, Itanium™, and AMD64 Architectures|
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Hard drive installations require a working Linux system installed and the use of ISO (or CD-ROM) images rather than the entire installation tree.
Hard drive installations only work from ext2 or ext3 file systems.
Set of CD-ROMs — Create CD-ROM ISO image files from each installation CD-ROMs. For each CD-ROM, execute the following command on a Linux system:
dd if=/dev/cdrom of=/tmp/file-name.iso
ISO images — transfer these images to the system to be installed.
Verifying that ISO images are intact before you attempt an installation, helps to avoid problems. To verify the ISO images are intact prior to performing an installation, use an md5sum program (many md5sum programs are available for various operating systems). An md5sum program should be available on the same Linux machine as the ISO images.