Reading (computer)

A human computer, with microscope and calculator, 1952

Action performed by computers, to acquire data from a source and place it into their volatile memory for processing.

- Reading (computer)
A human computer, with microscope and calculator, 1952

6 related topics

Relevance

The cache on the left holds each, for a total of M objects. The external memory on the right is unbounded.

External memory algorithm

In computing, external memory algorithms or out-of-core algorithms are algorithms that are designed to process data that are too large to fit into a computer's main memory at once.

In computing, external memory algorithms or out-of-core algorithms are algorithms that are designed to process data that are too large to fit into a computer's main memory at once.

The cache on the left holds each, for a total of M objects. The external memory on the right is unbounded.

The model captures the fact that read and write operations are much faster in a cache than in main memory, and that reading long contiguous blocks is faster than reading randomly using a disk read-and-write head.

Disk structure:
(A) track
(B) geometrical sector
(C) track sector
(D) cluster

Data cluster

Unit of disk space allocation for files and directories.

Unit of disk space allocation for files and directories.

Disk structure:
(A) track
(B) geometrical sector
(C) track sector
(D) cluster

However, a larger cluster size reduces bookkeeping overhead and fragmentation, which may improve reading and writing speed overall.

Modern DDR4 SDRAM module, usually found in desktop computers.

Memory refresh

Process of periodically reading information from an area of computer memory and immediately rewriting the read information to the same area without modification, for the purpose of preserving the information.

Process of periodically reading information from an area of computer memory and immediately rewriting the read information to the same area without modification, for the purpose of preserving the information.

Modern DDR4 SDRAM module, usually found in desktop computers.

As a consequence, the memory controller typically added a refresh cycle after each read cycle in order to create the illusion of a non-destructive read operation.

Asad Abidi

Pakistani-American electrical engineer.

Pakistani-American electrical engineer.

He was a visiting researcher at HP Labs for a year in 1989, during which time he investigated A/D conversion at ultra-high speeds, before returning to UCLA and researching analog signal chains for disk drive read channels, high-speed A/D conversion, and analog CMOS circuits for signal processing and communications.

John Cioffi

American electrical engineer, educator and inventor who has made contributions in telecommunication system theory, specifically in coding theory and information theory.

American electrical engineer, educator and inventor who has made contributions in telecommunication system theory, specifically in coding theory and information theory.

In 1984, Cioffi left Bell Labs to work at IBM as a hard disk drive read channel researcher.

A desktop PC clock generator, based on the chip ICS 952018AF and 14.3 MHz resonator (on the left)

Asynchronous communication mechanism

A desktop PC clock generator, based on the chip ICS 952018AF and 14.3 MHz resonator (on the left)

The role of an asynchronous communication mechanism (ACM) is to synchronize the transfer of data in a system between a writing process and a reading process operating concurrently.