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Always wondered the difference between disk(0) and rdisk(0)
multi(W)disk(X)rdisk(Y)partition(Z)
W: Specifies the drive controller number (also known as the ordinal number), typically 0. The first valid number is 0.
X: This value is always 0 when the multi() syntax is used.
Y: Specifies a physical hard disk attached to drive controller W. For ATA controllers, this number is typically between 0 and 3. For SCSI controllers, this number is typically between 0 and 7, or 0 and 15, depending on the adapter type. The first valid number is 0.
Z: Specifies the partition number on the physical disk specified by parameter Y, attached to the controller specified by parameter W. All partitions in use are assigned a number. The first valid number is 1.
scsi(W)disk(X)rdisk(Y)partition(Z)
W: Specifies the drive controller number (also known as the ordinal number), typically 0. The first valid number is 0.
X: Specifies a physical hard disk attached to drive controller W. For SCSI controllers, this number is typically between 0 and 7, or 0 and 15, depending on the adapter type. The first valid number is 0.
Y: Specifies the SCSI logical unit number (LUN) of the disk that contains the boot partition. This value is typically 0 when the scsi() syntax is used.
Z: Specifies the partition number on the physical disk specified by parameter Y, attached to the controller specified by parameter W. All partitions in use are assigned a number. The first valid number is 1.
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