random access


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random access

[′ran·dəm ′ak‚ses]
(computer science)
The ability to read or write information anywhere within a storage device in an amount of time that is constant regardless of the location of the information accessed and of the location of the information previously accessed. Also known as direct access.
A process in which data are accessed in nonsequential order and possibly at irregular intervals of time. Also known as single reference.

direct access

(1) See Microsoft DirectAccess.

(2) The ability to read or write a specific storage location without having to go through any locations before or after it. Generally synonymous with "random access." Magnetic disks, SSDs, optical data discs and RAM are the primary direct access hardware in a computer.

Access Via Software First
Data are commonly accessed by first scanning an index or by a direct access computation that determines their storage addresses. See index, direct access method and random file.


Early Direct Access
Using a deck of 3x14" magnetic cards, NCR's CRAM was a direct access storage device in the 1960s. By the end of that decade, magnetic disks were becoming mainstream. See CRAM for more details. (Image courtesy of NCR Corporation.)
References in periodicals archive ?
- Dynamic Random Access Memory (DRAM) Competitor Market Share Scenario Worldwide (in %): 2019 & 2025
Most of the previous researches on IEEE 802.16 random access focused on the legacy IEEE 802.16 BR schemes [6].
200MHz random access write operation: Elimination of the upper limit of the writing current by a 2T1MTJ cell enables high speed write operation.
It will initially test random access memory chips for Elpida and other clients.
Citation: United States - Countervailing Duty Investigation on Dynamic Random Access Memory Semiconductors (DRAMS) from Korea (WT/DS296/AB/R) (27 June 2005); U.S.
In addition to phase-change memory, there's magnetic random access memory, or MRAM, based on the electron's inherent magnetic property of spin.
Korea has long been a leader in commodity semiconductors, such as dynamic random access memory chips (DRAMs), while U.S.
Miniaturization, reduced power requirements, improved shock and vibration strategies are bringing the advantages of random access hard disk into the living room as well as the belt clip.
The approval covers assays for PAPP-A and free hCGB run on PerkinElmer's DELFIA Xpress random access platform.
Today's PCs should have at least 512 kilobytes of random access memory (RAM), and 1 megabyte is even better.
These include silicon based dynamic and static random access memory (RAM), magnetic hard disk drives, optical disks (including write once read many [WORM], magneto/optic, CD-ROM, and DVD disk, and magnetic tape.
Random access schemes for packet networks featuring distributed control require algorithms and protocols for resolving packet collisions that occur as the uncoordinated terminals contend for the channel.