Western Digital T13/2132-D - Manual (Page 36)

T13/2132-D Revision 3 June 23, 2010
24 Working Draft Enhanced Disk Drive - 4 (EDD-4)
7.3.3 Validation Entry
The first entry in the boot catalog is a validation entry. The validation entry shall be used to determine that a valid
boot catalog is on the disk and to determine the manufacturer of the CD. If this entry is valid, the remainder of
the boot catalog should be valid. Table 16 describes the format of a validation entry.
Table 16 — Validation Entry
Offset Type Description
00h Byte 01h - header ID
01h Byte Platform ID
ID Description
0 80x86
1 Power PC
2 Mac
02-03h Word Reserved
04h-1Bh Byte ID String. This shall indicate the manufacturer or developer of the CD.
1Ch-1Dh Word Checksum Word. This is the 2's compliment of all the words in this record. The sum of all
the words from 00h through 1Eh shall equal zero.
1Eh Byte Key Byte 55h
1Fh Byte Key Byte AAh