Cylinder 1024

Cylinder 1024 is the first cylinder of a hard disk that was inaccessible in the original IBM PC compatible hardware specification, interrupt 13h, which uses cylinder-head-sector addressing. At boot time very old BIOS of many PCs could only access the first 1024 cylinders, numbered 0 to 1023 as CHS addressing only defines 10 bits for the cylinder count (2^10=1024).

This was a problem for operating systems on the x86 platform as the BIOS must be able to load the bootloader and the entire kernel image into memory. Both of these must, therefore, be located on the first 1024 cylinders of the disk.

Older versions of Microsoft Windows resolved this by necessitating that the operating system was installed to the first partition. Because of this bug, users of the Linux operating system have traditionally created a /boot partition to reside within the first 1024 cylinders of the disk, containing little more than the kernel and bootloader.

See also

• Cylinders 0 to 79 of an Amiga Disk File (ADF)

External links

• Jonathan de Boyne Pollard (1996). "Disc and volume size limits". Frequently Given Answers. http://homepage.ntlworld.com./jonathan.deboynepollard/FGA/os2-disc-and-volume-size-limits.html.  — includes a discussion of the cylinder 1024 limitation.
• "Large Disk HOWTO - History of BIOS and IDE limits"

This microcomputer/microprocessor-related article is a stub. You can help Wikipedia by expanding it.v · Categories: Microcomputer stubs IBM PC compatibles Rotating disc computer storage media Hard disk computer storage Wikimedia Foundation. 2010. Игры ⚽ Поможем написать реферат Paul Xuereb Alfred Bitini Xuma Look at other dictionaries: Cylinder-head-sector — Cylinder head sector, also known as CHS, was an early method for giving addresses to each physical block of data on a hard disk drive. In the case of floppy drives, for which the same exact diskette medium can be truly low level formatted to… …   Wikipedia Cylinder/Head/Sector — Cylindre/Tête/Secteur  Cet article concerne la méthode d adressage informatique. Pour d autres sens de l abréviation, voir CHS. L adressage en CHS (abréviation de Cylinder/Head/Sector en anglais soit « Cylindre/Tête/Secteur » en… …   Wikipédia en Français Cylinder Head Sector — Der Begriff Cylinder Head Sector (per Track) („Zylinder Kopf Sektor (pro Spur)“, abgekürzt CHS) beschreibt eine Adressierungsmethode von Festplatten. Diese ermöglicht dem Computer die Erkennung der Festplattengeometrie des Datenträgers und dessen …   Deutsch Wikipedia Hard disk drive — Hard drive redirects here. For other uses, see Hard drive (disambiguation). Hard disk drive Mechanical interior of a modern hard disk drive Date invented 24 December 1954 [1] …   Wikipedia Объём жёсткого диска — Динамика роста ёмкости жёстких дисков с 1980 года. Ось Y в логарифмическом масштабе, поэтому аппроксимирующая линия соответствует …   Википедия Жёсткий диск — Запрос «HDD» перенаправляется сюда; см. также другие значения …   Википедия Logical block addressing — (LBA) is a common scheme used for specifying the location of blocks of data stored on computer storage devices, generally secondary storage systems such as hard disks. The term LBA can mean either the address or the block to which it refers.… …   Wikipedia Binary prefix — Prefixes for bit and byte multiples Decimal Value SI 1000 k kilo 10002 M mega …   Wikipedia Timeline of binary prefixes — This article presents a terminology timeline of binary prefixes.1940s; 1943 1944:*J.W. Tukey coins the word bit as an abbreviation of binary digit . [http://catb.org/ esr/jargon/html/B/bit.html The Jargon File (version 4.4.7)] ] ; 1948:*… …   Wikipedia Logical block addressing — Para otros usos de este término, véase LBA (desambiguación). Logical block addressing (LBA: direccionamiento de bloque lógico) es un método muy común usado para especificar la localización de los bloques de datos en los sistemas de almacenamiento …   Wikipedia Español 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”