Western Digital T13/2132-D - Manual (Page 40)

T13/2132-D Revision 3 June 23, 2010
28 Working Draft Enhanced Disk Drive - 4 (EDD-4)
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