Western Digital manual T13/2132-D Revision June 23 Section Entry Extension, Bit Description

T13/2132-D Revision 3 June 23, 2010

7.3.7 Section Entry Extension

Section Entry Extensions may follow Section Entries. Section Entry Extensions provide more space for selection criteria when the 13h bytes provided by the Section Entry are insufficient. There may be one or more extensions following each Section Entry. This means that a section provides 13h bytes of selection information. A section with one extension provides 43 bytes, and a section with two extension provides 73 bytes, etc. Table 20 describes a Section Entry Extension.

Table 20 — Section Entry Extension

Offset	Type		Description
00h	Byte	44h - Header ID, indicates a Section Entry Extension
01h	Byte	Extension continuation information
		Bit	Description
		00h-04h	Reserved
		05h	Shall be cleared to zero if this is the final extension
			for this section. Shall be set to one if more
			extensions follow this extension.
		06h-07h	Reserved
02-1Fh	Byte	Additional selection criteria

28 Working Draft Enhanced Disk Drive - 4 (EDD-4)