access time


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Related to access time: seek time

access time

Computing the time required to retrieve a piece of stored information

access time

[′ak·ses ‚tīm]
(computer science)
The time period required for reading out of or writing into the computer memory.

access time

(hardware, storage)
The average time interval between a storage peripheral (usually a disk drive or semiconductor memory) receiving a request to read or write a certain location and returning the value read or completing the write.

access time

(1) Memory access time is how long it takes for a character in RAM to be transferred to or from the CPU. Fast RAM chips have an access time of 10 nanoseconds (ns) or less. See SDRAM.

(2) Disk access time is how long it takes to obtain the first data character after initiating a request. It includes the time to move the read/write head to the track (seek time) and time to rotate the platter to the sector (latency). Disk access time is always given as an average, because seek time and latency vary depending on the current position of the head and platter.

Disk vs. SSD
While access times of fast hard disks are typically from 5 to 10 milliseconds, solid state drive (SSD) access times are in the 25 to 100 microsecond range. SSDs are as much as 100 times faster because there is no seek time or latency associated with flash memory storage. However, access times for all storage types are only one metric. Channel speed (transfer rate) and caching contribute significantly to overall storage performance. See cache, seek time and latency.
References in periodicals archive ?
When the VM [v.sub.m'] (1 [less than or equal to] m' [less than or equal to] M) needs to extract [d.sub.w], the data access time is denoted as [r.sub.m',w], which is calculated by
Making main memory access time to become (s' + s'") access time.
According to the statistical probability of data access, the TAB algorithm broadcasts a significant number of copies for popular data in a broadcast cycle to diminish the average access time. In addition, the proposed algorithm balances the interbroadcast time of successive copies of a single packet of data even though data-item sizes can vary.
The horizontal axis is the "Ping" round trip time [T.sub.RT], and the vertical axis is the access time [T.sub.A] of the "getValues" service.
Clients 42 Managers 1 Server Cache Size 128 MB Local Memory Access Time 0.25 ms Disk Access Time 15.85 ms Warm-up Block Accesses 400,000 Servers 1 Client Cache Size 16 MB Block Size 8 KB Remote Memory Access Time 1.25 ms Write Policy write-through Message Latency 0.2 ms Most of the simulation parameters are derived from the original study on cooperative caching by Dahlin et al.
Those "boxes with brains" set managers everywhere free from the tyranny of limited computer access time and ushered in a new era in information management.
For no fee beyond normal access time charges, members and nonmembers can read the messages and leave ones of their own.
The most common measurement of disk speed is its average access time: how long it takes the computer to locate and retrieve data.
The cartridge for the UGC-144 will store 720 kB of data with an average access time of 30 ms.
* Access Time Reading and Writing (Average and Cumulative)
When online, access time to data on tape is typically several seconds vs.

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