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You are here: Home » Access Time in Computing

By Abhishek Ghosh May 5, 2013 10:40 pm Updated on May 5, 2013

Access Time in Computing

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Access time is in addition to the data transfer rate is an important measure of performance of storage devices such as hard drives or optical drives and other storage media such as RAM. Access time describes how quickly the appropriate storage media after the arrival of a write or read command perform the appropriate operation and provide the corresponding data.

 

Access Time in Volatile Memory

 

The processor registers of a computer has the fastest access time, as these usually operate with the clock frequency of the processor. There are only a very limited number of these registers, their access time is modern processors well below a nanosecond. The next fastest access time has the processor cache of a computer. This is usually as SRAM and executed either within the processor and/or the motherboard. Its access time is in the range of a few nanoseconds. The memory of a computer is generally substantially greater than the processor cache. The access time to memory is higher (about 60-70 nanoseconds) than the access time to the processor cache. Thee so-called working memory can be the RAM disks which are set up to be accessed like a hard drive, but the access time and impermanence are the differences.

 

Access Time in Non-volatile memory

 

Access Time

 

In flash memory , like the technology used in memory card , USB sticks and increasingly also in Solid State Drive eliminating the need for mechanical movement of a read-write head. Those memories have significantly shorter access times (about 250 ms magnitude) than hard drives or optical drives, but at higher cost.

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In rotating media such as hard drives or optical media such as CDs / DVDs, the access time is composed of the time required to position the read-write head over the track is required (also known as seek time) and the latency time that elapses until the right sector on the media under the head appears (latency). In a mostly assumed random distribution of requests only the information of an average access time is useful when the parameters are (previous head position and sector position) equally distributed.

Modern hard disk drives, depending on the rotational speed , has average access times of about 9 ms (typical 7,200 rpm). SATA drives have mechanisms that allow a rearrangement of arriving at the drive to shorten the access time ( native command queuing ).

 

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Abhishek Ghosh

About Abhishek Ghosh

Abhishek Ghosh is a Businessman, Surgeon, Author and Blogger. You can keep touch with him on Twitter - @AbhishekCTRL.

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About This Article

Cite this article as: Abhishek Ghosh, "Access Time in Computing," in The Customize Windows, May 5, 2013, February 1, 2023, https://thecustomizewindows.com/2013/05/access-time-in-computing/.

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