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Linux in a Nutshell, Fourth Edition by Aaron Weber, Stephen Figgins, Ellen Siever

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Name

root

Synopsis

                     root 
                     device [hdbias]

Set the root device to the specified device and attempt to mount it to get the partition size (and some additional information for booting BSD kernels). If you are booting a BSD kernel, you can specify hdbias to tell the kernel how many BIOS drive numbers are before the current one.

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