El Torito (CD-ROM standard)

El Torito (CD-ROM standard)

The El Torito Bootable CD Specification is an extension to the ISO 9660 CD-ROM specification. It is designed to allow a computer to boot from a CD-ROM. It was announced in November 1994 [cite press release
title = Phoenix announces bootable CD-ROM specification; Specification developed jointly by Phoenix and IBM
publisher = Phoenix Technologies Ltd.
date = 1994-11-11
url = http://www.thefreelibrary.com/Phoenix+announces+bootable+CD-ROM+specification%3b+Specification...-a015922225
accessdate = 2008-01-31
] and first issued in January 1995 as a joint proposal by IBM and BIOS manufacturer Phoenix Technologies.

A modern PC BIOS will search for boot code on a ISO 9660 CD according to the El Torito specification. If the CD contains bootable code, the BIOS will assign a BIOS drive number to the CD drive. The drive number assigned is either 80 (hard disk emulation), 00 (floppy disk emulation) or an arbitrary number if the BIOS should not provide emulation.

Emulation allows older operating systems to be booted from a CD, by making it appear to them as if they were booted from a hard or floppy disk. Newer operating systems do not require emulation to boot; all that is needed is an appropriate boot loader such as ISOLINUX.

Name origin

According to legend, the El Torito CD/DVD extension to ISO 9660 gained its name because its design originated in an El Torito restaurant in Irvine, California. [Citation | last = Parker
first = Dana J.
title = Fresh Tortillas and CD-ROM Standards: The El Torito Bootable CD-ROM Specification
periodical = CD-ROM Professional
volume = 8
issue = 7
url = http://web.archive.org/web/19991008045553/http://www.cdpage.com/Compact_Disc_Variations/danaboot.html
archiveurl = http://web.archive.org/web/19991008045553/http://www.cdpage.com/Compact_Disc_Variations/danaboot.html
accessdate = 2008-01-31
] The initial two authors were Curtis Stevens, of Phoenix Technologies, and Stan Merkin, of IBM. ["Ibid."]

ee also

*Boot disk
*Live CD


External links

* [http://www.phoenix.com/NR/rdonlyres/98D3219C-9CC9-4DF5-B496-A286D893E36A/0/specscdrom.pdf The "El Torito" Bootable CD-ROM Format Specification, Version 1.0] (PDF)
* [http://www.kernel.org/git/?p=boot/syslinux/syslinux.git;a=blob;hb=HEAD;f=isolinux.asm ISOLINUX source code] (see isolinux.asm line 294 onward)
* [http://www.cs.cmu.edu/afs/cs.cmu.edu/user/ralf/pub/WWW/files.html Ralf Brown's interrupt list] (see int 13h in interrup.b, esp. functions 4a to 4d)
* [http://littlesvr.ca/isomaster/eltoritosuppl.php EL Torito Specification Supplement] , discusses shortcomings of the standard

Wikimedia Foundation. 2010.

См. также в других словарях:

  • El Torito (CD-ROM Standard) — Saltar a navegación, búsqueda La Especificación de CD Autoarrancable El Torito es una extensión a la especificación ISO 9660 de CD ROM. Diseñada para permitir a una computadora arrancar desde un CD ROM, fue lanzada por primera vez en enero de… …   Wikipedia Español

  • CD-ROM — Media type Optical disc Capacity 194 MiB (8 cm) 650–900 MiB (12 cm) Read mechanism 150 KiB/s (1×) 10,800 KiB/s (72×) Write mechanism 150 KiB/s (1×) 8,400 KiB/s (56×) Standard …   Wikipedia

  • CD-ROM — Logo officiel Un CD ROM (abréviation de Compact Disc Read Only Memory) ou cédérom[1] est un disque optique utilisé pour stocker des données sous forme numéri …   Wikipédia en Français

  • Red Book (CD standard) — Compact Disc Digital Audio Media type Optical disc Encoding 2 channels of LPCM audio, each signed 16 bit values sampled at 44100 Hz …   Wikipedia

  • CD-ROM — Speichermedium Compact Disc Read Only Memory (CD ROM) Allgemeines Typ optisch Kapazität 650 MB bis 879 MB [1] …   Deutsch Wikipedia

  • BD-ROM — Disque Blu ray Pour les articles homonymes, voir BD (homonymie) et BLU. Disque Blu ray Type de média …   Wikipédia en Français

  • CD-ROM XA — Работа с оптическими дисками Оптический диск Образ оптического диска, ISO образ Эмулятор оптических дисководов Программное обеспечение для работы с файловыми системами оптических дисков Технологии записи Режимы записи Пакетная запись Типы… …   Википедия

  • Syslinux — Desarrollador H. Peter Anvin syslinux.zytor.com …   Wikipedia Español

  • BOCHS — Saltar a navegación, búsqueda Bochs …   Wikipedia Español

  • Compact Disc — CD redirects here. For other uses, see CD (disambiguation). Not to be confused with DVD. Compact disc The readable surface of a Compact Disc incl …   Wikipedia

Поделиться ссылкой на выделенное

Прямая ссылка:
Нажмите правой клавишей мыши и выберите «Копировать ссылку»