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A direct-access storage device (DASD) (pronounced /ˈdæzdiː/) is a secondary storage device in which "each physical record has a discrete location and a unique address". The term was coined by IBM to describe devices that allowed random access to data, the main examples being drum memory and hard disk drives. Later, optical disc drives and flash memory units are also classified as DASD. The DASD storage class includes both fixed and removable media.

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rdf:type	yago:WikicatComputerStorageDevices yago:Artifact100021939 yago:Device103183080 yago:Instrumentality103575240 yago:MemoryDevice103744840 yago:Object100002684 yago:PhysicalEntity100001930 yago:WikicatIBMStorageDevices device yago:Whole100003553
rdfs:label	Direct Access Storage Device (de) Dispositivo de almacenamiento de acceso directo (es) Direct-access storage device (en) Direct access storage device (ja) 직접 접근 기억 장치 (ko)
rdfs:comment	직접 접근 기억 장치(direct access storage device, DASD)는 메인프레임 컴퓨터와 일부 미니컴퓨터의 보조 기억 장치를 가리키는 용어로, 개별 물리 레코드가 구별된 위치와 고유 주소를 지니고 있는 기억 장치를 말한다. 역사적으로 IBM은 이 용어를 다음과 같은 3가지 종류의 장치에 적용한다: 1. * 디스크 드라이브 2. * 자기 드럼 3. * 현재는 CD-ROM과 DVD-ROM 장치 또한 DASD로 분류하기도 한다. (ko) Direct access storage device（DASD、ダスド、直接アクセス記憶装置）とは、メインフレームやミニコンピュータなどのコンピュータにおける、大容量ながら比較的低速で、直接アクセスの補助記憶装置を指す。 (ja) Ein Direct Access Storage Device, kurz DASD, ist ein Gerät für den direkten Speicherzugriff. Der Begriff wird hauptsächlich bei Großrechnern (englisch mainframes) genutzt und bezeichnet im wesentlichen Sinn Festplatten. (de) A direct-access storage device (DASD) (pronounced /ˈdæzdiː/) is a secondary storage device in which "each physical record has a discrete location and a unique address". The term was coined by IBM to describe devices that allowed random access to data, the main examples being drum memory and hard disk drives. Later, optical disc drives and flash memory units are also classified as DASD. The DASD storage class includes both fixed and removable media. (en) En computadores centrales y algunos minicomputadores, un dispositivo de almacenamiento de acceso directo (direct access storage device o DASD en inglés) es cualquier tipo de dispositivo de almacenamiento secundario que tiene un tiempo de acceso bajo en proporción a su capacidad. (es)
dcterms:subject	IBM storage devices IBM mainframe operating systems
Wikipage page ID	54691 (xsd:integer)
Wikipage revision ID	1078175313 (xsd:integer)
Link from a Wikipage to another Wikipage	Punched card Queued indexed sequential access method Basic indexed sequential access method VM (operating system) VSE (operating system) ESCON OS/VS2 Queued sequential access method Optical disc drive MVS Z/OS IBM storage devices Data set (IBM mainframe) Disk array Drum memory Count Key Data DFSMS Execute Channel Program Flash memory Basic direct access method Basic partitioned access method Basic sequential access method History of IBM magnetic disk drives Redundant array of independent disks Hard disk drive History of IBM CKD Controllers Tape drive Fixed block architecture Access method IBM mainframe operating systems Block (data storage) Fibre Channel Execute channel program Metro Mirror IBM IBM Enterprise Storage Server Channel I/O Start Input/Output FICON IBM 2321 Data Cell ISAM Execute Channel Program in Real Storage Virtual storage access method Random access Unit record equipment Sequential access Z/VSE Secondary storage Channel program Indexed sequential access method QSAM Global Mirror Sequential access method
sameAs	Direct-access storage device Direct-access storage device Direct-access storage device Direct-access storage device Direct-access storage device Direct-access storage device Direct-access storage device Direct-access storage device Direct-access storage device
dbp:wikiPageUsesTemplate	dbt:About dbt:Efn dbt:IPAc-en dbt:Main dbt:More_citations_needed dbt:Notelist dbt:Reflist dbt:Short_description dbt:Snd dbt:Cleanup_weighted
has abstract	A direct-access storage device (DASD) (pronounced /ˈdæzdiː/) is a secondary storage device in which "each physical record has a discrete location and a unique address". The term was coined by IBM to describe devices that allowed random access to data, the main examples being drum memory and hard disk drives. Later, optical disc drives and flash memory units are also classified as DASD. The term DASD contrasts with sequential access storage device such as a magnetic tape drive, and unit record equipment such as a punched card device. A record on a DASD can be accessed without having to read through intervening records from the current location, whereas reading anything other than the "next" record on tape or deck of cards requires skipping over intervening records, and requires a proportionally long time to access a distant point in a medium. Access methods for DASD include sequential, partitioned, indexed, and direct. The DASD storage class includes both fixed and removable media. (en) Ein Direct Access Storage Device, kurz DASD, ist ein Gerät für den direkten Speicherzugriff. Der Begriff wird hauptsächlich bei Großrechnern (englisch mainframes) genutzt und bezeichnet im wesentlichen Sinn Festplatten. Allgemein bedeutet Direct Access Storage Device eine Kategorie von Datenspeichergeräten, auf die direkt auf Informationen zugegriffen werden kann, ohne sich über alle Speicherbereiche sequentiell bis zum gewünschten Element durcharbeiten zu müssen: Während es sich bei einem Diskettenlaufwerk um eine DASD-Einheit handelt, ist das beim Magnetbandgerät nicht der Fall, da hier die Daten als lineare Blöcke gespeichert werden. Der Begriff DASD findet sich z. B. bei den Betriebssystemen IBM z/OS, MVS, Z/VM, seltener bei Siemens BS2000. Unter z/OS ist DASD ein möglicher Datenspeicher für ein Dataset, das vom System Managed Storage verwaltet wird. Auch im Bereich der mittleren Datenverarbeitung von IBM (OS/400, i-Series) wird der Begriff genutzt. Selten findet sich DASD auch als Synonym für Festplatten bei Personal Computern. (de) En computadores centrales y algunos minicomputadores, un dispositivo de almacenamiento de acceso directo (direct access storage device o DASD en inglés) es cualquier tipo de dispositivo de almacenamiento secundario que tiene un tiempo de acceso bajo en proporción a su capacidad. Históricamente, el término fue introducido por IBM para cubrir tres tipos de dispositivos diferentes: discos duros, tambores y . La funcionalidad de acceso directo, ahora llamada acceso aleatorio, de esos dispositivos era el opuesto al acceso secuencial usado en cintas magnéticas, mucho más lento al acceder a un punto distante en el dispositivo. Tanto los tambores como las células han desaparecido como productos en sí, de modo que DASD es ahora un sinónimo de dispositivo de disco. Los discos modernos usados en computadoras centrales son raramente discos individuales sino más bien grandes conjuntos de discos usando esquemas RAID. (es) 직접 접근 기억 장치(direct access storage device, DASD)는 메인프레임 컴퓨터와 일부 미니컴퓨터의 보조 기억 장치를 가리키는 용어로, 개별 물리 레코드가 구별된 위치와 고유 주소를 지니고 있는 기억 장치를 말한다. 역사적으로 IBM은 이 용어를 다음과 같은 3가지 종류의 장치에 적용한다: 1. * 디스크 드라이브 2. * 자기 드럼 3. * 현재는 CD-ROM과 DVD-ROM 장치 또한 DASD로 분류하기도 한다. (ko)

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