GRUB device naming

GRUB refers to disk devices as follows:

(xdn[,m])

The xd in this example will be either fd or hdfloppy disk or hard disk, respectively. The n refers to the number of the disk as seen by the BIOS, starting at 0. The optional ,m denotes the partition number, also starting at 0.

The following are examples of valid GRUB device names:

(fd0)

The first floppy disk

(hd0)

The first hard disk

(hd0,1)

The second partition on the first hard disk

Note that GRUB does not distinguish between IDE and SCSI/SATA disks. It refers only to the order of the disks as seen by the BIOS, which means that the device number that GRUB uses for a given disk will change on a system with both IDE and SCSI/SATA if the boot order is changed in the BIOS.

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