Format of Six-Byte SCSI Command Descriptor Block (CDB):
Offset	Size	Description	)
 00h	BYTE	operation code (see #03239)
 01h	BYTE	logical unit number (bits 7-5), SCSI-1/SCSI-2
		MSB of logical block address (bits 4-0)
 02h	WORD	logical block address (low word)
 04h	BYTE	transfer length
 05h	BYTE	control byte
SeeAlso: #03237,#03238