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 ?
The new technology applies to distributed object storage*, and in test cases of access concentrations on the Internet, has been proven to ease those concentrations by approximately 70%, resulting in an improvement in access times of tenfold or greater.
When online, access time to data on tape is typically several seconds vs.
The new devices are capable of achieving an access time of 60 nanoseconds (ns), the fastest access time currently available for 128Mb NOR flash.
Certainly, the faster access time will be very desirable compared to disk or tape, with compression rates as great as they are and the durability of MRAM devices, but more complex technologies would be required to meet the capacity demands of the mass storage universe.
By providing the industry with the fastest asynchronous devices on the market and synchronous zero-wait-state Level 2 (L2) cache solutions, we've not only gained a higher percentage of the market, but we've also positioned ourselves as a key, reliable supplier of x 18 devices with access times of 9-nanoseconds and less.
In long-term data retention, raw access time becomes less important and data authenticity and trust-worthiness, timely access to data and low Total Cost of Ownership come to the forefront.
Access times of 13ns make possible operation at rated frequencies with no wait states when used with 67MHz and 75MHz 3.
In pipelined mode, the devices operate with clock rates up to 250MHz and with clock access times less than 2.
Tape is notorious for slow file access times, but what is acceptable on low-capacity, single drive tapes becomes impossible as per tape capacity rises or when tape drives are integrated into robotic tape libraries.
Since deployment, the Seoul server has become the most active outside of the USA, now processing over 1000 queries a second; while the Beijing server has provided a 15-fold improvement in DNS access times to local Internet users.

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