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 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 ?
Just as the number of access times, there was also a significant decrease (p < 0.05) between students' grades in first test (with median 8.000, first quartile 7.400, and third quartile 8.700) and in the second test (with median 7.400, first quartile 6.600, and third quartile 7.750) (Wilcoxon Test).
Based on Table 4, reduced correlation SNS access times and the relevant learners' Satisfaction level for Reproductive Design Education is described in Table 5 and its auxiliary parameters for statistical analysis are calculated and contained in Table 6.
Study showed that real-time ultrasound-guided catheterization of the internal jugular vein offers the advantage of a shorter access time and a reduced number of successful attempts compared with the landmark-guided technique.
Another test was conducted using 16 servers to determine access time as viewed from the user's perspective.
When online, access time to data on tape is typically several seconds vs.
The 64 Mbit M29DW640D Flash memory chip operates from 2.7 to 3.6V and a choice of 70ns or 90ns random access times. Each version is available with either a 0 degrees to +70 degrees C or -40 degrees to +85 degrees operating temperature range.
The SigmaRAM architecture presents an open set of standards that deliver very fast clock speeds, exceptionally quick access times, high density, outstanding noise immunity, and extremely wide buses.
Designed with the operator in mind, the key may be inserted into the lock either way up, reducing access times to plant and machinery.
The Department of Health welcomed the report, adding: "Work is in hand to increase capacity and improve access times."
The measurements used to calculate the access times were taken each hour from a number of different locations across the UK and Ireland.

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