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(grub.info)Filesystem

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Filesystem syntax and semantics
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   GRUB uses a special syntax for specifying disk drives which can be
accessed by BIOS. Because of BIOS limitations, GRUB cannot distinguish
between IDE, ESDI, SCSI, or others. You must know yourself which BIOS
device is equivalent to which OS device. Normally, that will be clear if
you see the files in a device or use the command `find' (Note: find).

Device syntax

How to specify devices

File name syntax

How to specify files

Block list syntax

How to specify block lists