access time

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Related to Access Times: Disk access 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.
Axonix - a longtime provider of portable CD-ROM drives for notebook computers - has both 4x and 6x variants, with an amazing 160-ms access time.
NEC's new InterSect CDR-37 portable CD-ROM has an access time of 450 milliseconds and data transfer rate of 150KB/second, weighs 2.
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.
Broad ranges continue to exist within all four parameters and some obvious access time and cost gaps remain within the hierarchy.
For applications that don't need such fast access times, some versions in the HM62V16102I and HM62A16102I series have a 35-ns access time.
The chip features an asynchronous random access time as short as 70ns, making it the fastest 32 Mbit Flash chip available for the industrial temperature range.
The NAS-250 will deliver 4x to 10x better access times than typical NAS devices.
The access time was measured using a 4-megabit (Mb) core; smaller cores can produce faster access times.
Common for all the products will be access times of less than 3.
AMD (NYSE:AMD) today introduced the Am29PL320 flash memory device with the industry's widest databus and with page access times as fast as 20 nanoseconds.

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