Western Digital T13/2132-D - Manual (Page 69)

June 23, 2010 T13/2132-D Revision 3
Working Draft Enhanced Disk Drive - 4 (EDD-4) 57
8.20.4.9.10 Bits 9-10 - translation type
If bit 3 is cleared to zero then this field shall be ignored and shall be zero. If bit 3 is set to one then this field
identifies the geometric translation shown in table 26.
8.20.4.9.11 Bit 11 - Ultra DMA
If the system is configured for Ultra DMA, this bit shall be set to one and byte 8 (DMA Channel/DMA Type) should
be used to configure the system. If this bit and bit 1, (Bit 1 = fast DMA, clause 8.24.3.9.2) are cleared to zero,
then the DMA Channel/DMA Type field shall be ignored.
8.20.4.9.12 Bit 12 - HPA Active
The HPA Active bit shall be set to one if the Host Protected Area (HPA) is active. The HPA is active if a volatile
or non-volatile SETMAX has been issued with a value other than the NATIVE MAX address. This bit shall be
cleared to zero if NATIVE MAX sectors can be accessed using read and/or write commands.
8.20.4.9.13 Bit 13h - 48-bit LBA addressing enabled
The 48-bit LBA addressing enabled bit shall be set to one if the INT 13h handler is using 48-bit extended
commands to access the device. The 48-bit LBA addressing enabled bit shall be cleared to 0 if the INT 13h
handler is not using 48-bit extended commands to access the device.
8.20.4.9.14 Bits 14-15 - Reserved
8.20.4.10 Offset 12-13h - Reserved
8.20.4.11 Offset 14 - table revision
The table version shall be set to 30h indicating compliance with this standard.
8.20.4.12 Offset 15 - checksum
This shall be the two's complement of the 8-bit unsigned sum of bytes 0 through 14. Adding bytes 0 through 15
shall in all cases produce an 8-bit result of zero.
Table 26 — Translation Type
Bits 9-10 Description
00b Bit-shift translation
01b LBA assisted translation
10b Reserved
11b Vendor specific translation