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 memory to be transferred to or from the CPU. In a PC or Mac, fast RAM chips have an access time of 70 nanoseconds (ns) or less. SDRAM chips have a burst mode that obtains the second and subsequent characters in 10 ns or less.

(2) Disk access time is an average of the time between initiating a request and obtaining the first data character. It includes the command processing, the average seek time (moving the read/write head to the required track) and the average latency (rotation of disk to the required sector). This specification must be given as an average, because seek times and latency can vary depending on the current position of the head and platter.

Fast hard disks have access times of 10 milliseconds (ms) or less. This is a common speed measurement, but overall disk performance is significantly influenced by channel speed (transfer rate), interleaving and caching. See cache, seek time and latency.
References in periodicals archive ?
A higher RPM improves access times which in turn affects transfer speed positively.
However, unlike the traditional XPM products, actual availability & actual access time depend on Kilopass' characterization data and foundry model.
Optical disk has been squeezed from the general storage hierarchy, as it has not kept pace with magnetic disk and tape developments in areal density, price, access time, and performance.
Faster access to data with an innovative high-speed "fast forward" search speed that reduces average file access time to less than 30 seconds.
To satisfy these requirements, Sharp has completed the development of a 128Mbit Flash memory that has achieved a maximum access time of 60 ns (2-wait), the fastest in the industry to date, up from the conventional 85 ns (3-wait).
TM), the established pioneer in introducing innovative flash drive solid state disk storage solutions, today announced they are joining efforts in identifying and resolving application input/output (I/O) and access time bottlenecks by deploying a best of breed, highly efficient integrated solid state disk (SSD) and storage management software solution.
The joint disk-based backup solution offers the ability to use XIOtech's MAGNITUDE storage platform as a primary backup medium, virtually eliminating backup-media access time and dramatically increasing backup and recovery performance.
Services start at $13 per month for a basic dialup plan, which includes 150 hours of access time, 1 e-mail account, and 2 megabytes of web space.