Western Digital T13/2132-D manual Foreword, Introduction

Page 11

June 23, 2010

T13/2132-D Revision 3

Foreword

Foreword

(This foreword is not part of American National Standard NCITS.xxx-200x)

DOS accesses its mass storage devices using an INT13h programming interface provided by BIOS firmware to higher-level software. This interface was designed in the early 1980's, upgraded in the late 1980's and upgraded again in the early 1990's. Initially, INT 13h used a cylinder-head-sector interface that was limited to approx.

528MB of disk addressing. Later this same interface was upgraded to support approx. 8.4GB of disk addressing. Finally, extended functions were created that allowed 64-bit disk addressing. At this same time, specifications were created that allowed the CD or DVD ROM drive to boot using the same INT 13h interface that hard drives used. The Disk and CD/DVD functions have never been fully documented in a standards forum. This standard enables the following capabilities:

a)CHS addressing with an 8.4GB limitation;

b)Logical Block Addressing (LBA);

c)removes the requirement of using interrupt 41h/46h to point at the Fixed Disk Parameter Table information;

d)makes location and configuration information available to operating systems that do not use the BIOS to access mass storage devices;

e)use data structures that apply to both IA-32 and IA-64 compatible architecture systems;

f)use data structures that can address media capacities for the next 20 years; and

g)boot from CD or DVD.

Requests for interpretation, suggestions for improvement and addenda, or defect reports are welcome. They should be sent to the NCITS Secretariat, Information Technology Industry Council, 1250 I Street NW, Suite 200, Washington, DC 20005-3922.

This standard was processed and approved for submittal to ANSI by National Committee for Information Technology Standardization (NCITS). Committee approval of this standard does not necessarily imply that all committee members voted for approval. At the time it approved this standard, NCITS had the following members:

Editor’s Note 1: Insert INCITS Membership List Here

Technical Committee T13h on ATA Interfaces, that reviewed this standard, had the following members and additional participants:

Dan Colegrove, Chair

Jim Hatfield, Vice-Chair

Mark Overby, Secretary

Editor’s Note 2: Insert T13h Membership List Here

Introduction

This standard encompasses the following:

Clause 1 describes the scope.

Clause 2 provides normative references.

Clause 3 provides definitions, abbreviations, and conventions.

Clause 4 is the overview.

Clause 5 is INT 13h functions limited to 8GB if disk addressing.

Clause 6 is INT 13h functions not limited to 8GB of disk addressing.

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

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Contents Revision June 23 Information technology Enhanced Disk Drive 4 EDD-4Working Draft Enhanced Disk Drive 4 EDD-4 Points of ContactT13/2132-D Revision 3June 23 June 23 T13/2132-D Revision DraftT13/2132-D Revision June 23 American National StandardNew Capabilities added to EDD-4 Document StatusContents Working Draft Enhanced Disk Drive 4 EDD-4 Vii Viii Working Draft Enhanced Disk Drive 4 EDD-4 Output Parameters TablesFigures Introduction ForewordXii Working Draft Enhanced Disk Drive 4 EDD-4 American National Standard for Information Technology ScopeBSR Incits ATA8-APT ATA8-AST Approved Ansi References Name Normative references GeneralApproved references References Under Development Name Project Number References under developmentOther references June 23 T13/2132-D Revision Abbreviation Meaning Symbols and abbreviationsMaster Boot Record MBR The first LBA on a disk ConventionsOrdered lists PrecedenceLists Lists overview Unordered listsNumbering T13/2132-D Revision June 23 KeywordsBit conventions Register and CF ContentsInterrupt Services and Functions Numbering conventions French English This standardQWord at word offset n ByteWord at offset n DWord at word offset nByte Value ATA string byte swapping Word Byte Character in stringATA firmware revision example WordOverview Bit Description 8GB INT 13h Functions Conventional FunctionsConventional Register Definitions Register DescriptionConventional Function Definitions Function a Description Function Description 8GB INT 13h Functions OverviewData Structure Extended Function DefinitionsT13/2132-D Revision June 23 Device Address Packet Offset INT 13h Interface Subsets Fixed Disk Access SubsetFixed Disk Access Function Code Removable MediaEDD Support Function Code Locking and Ejecting Function CodeEnhanced Disk Drive EDD Support Subset ISO 9660 CD Layout Working Draft Enhanced Disk Drive 4 EDD-4 CD/DVD Boot OverviewSystem Area Unused Emulation Process Boot MethodsFloppy Geometries Type Cylinders Heads Sectors No Emulation BootFloppy Boot Hard Drive BootCD/DVD Format Boot Volume Descriptor BVDBoot Volume Descriptor Offset Type Description T13/2132-D Revision June 23 Validation EntrySection Header June 23 T13/2132-D Revision Initial/Default Entry00h Byte Header ID Type Description June 23 T13/2132-D Revision Section EntryT13/2132-D Revision June 23 Section Entry Extension INT 13h Function Definitions Overview Reset Disk Subsystem FN 00h Get Status of Last Operation FN 01h Read Sectors into Memory FN 02h Write Sectors From Memory FN 03h Verify Sectors FN 04h Get Drive Parameters FN 08h Read Buffer FN 0Eh Write Buffer FN 0Fh Value Description Get Disk Type FN 15hSet Media Type FN 18h Park Heads FN 19h Identify Device Information FN 25h Interface Support Bit Map Description Check Extensions Present FN 41hExtended Read FN 42h Extended Write FN 43h Verify Sectors FN 44h Lock/Unlock Media FN 45h Eject Removable Media FN 46h Result Buffer Get Device Parameters FN 48hAscii Interface Path Definitions part 1 Host Bus Type Offset T13/2132-D Revision June 23 Interface PathDevice Path Definition00h ATA Device 01h 02h..FFh Reserved Byte Word DWord QWord Byte Port number Device parameter table extension Offset 2-3 control port base Offset 5 Bios use only Bios use only Offset 6 IRQ numberOffset 7 READ/WRITE Multiple command block count Offset 0-1 I/O port baseOffset 9 PIO type Offset 10-11 Bios selected hardware specific option flagsBit 7 32-bit transfer mode Bit 8 Atapi device uses command packet interruptBit 11 Ultra DMA Bit 13h 48-bit LBA addressing enabledJune 23 T13/2132-D Revision Bits 9-10 translation type Translation Type Bits DescriptionGet Extended Media Change Status FN 49h Initiate Disk Emulation FN 4Ah Value Emulation Working Draft Enhanced Disk Drive 4 EDD-4 Terminate Disk Emulation FN 4Bh Initiate Disk Emulation & Boot FN 4Ch CD Command Packet Return Boot Catalog FN 4DhHardware Configuration Sub-Functions Set Hardware Configuration FN 4EhFormatted Command Packet Offset Type Description Send Packet Command FN 50hFormatted Protocol Specific Data T13/2132-D Revision June 23 Output Parameters Security Protocol Commands FN 51h INT 15h Removable Media Eject Annex a Hybrid MBR boot Hybrid MBR boot overviewGPT support for hybrid MBR boot code Hybrid MBR boot code EAX Hybrid MBR boot code endeavor procedureHybrid VBR boot code