Computer Terms I/O Bus -- Term Paper

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Direct Memory Access (DMA) -- Designed for higher efficiency in programming tasks and the development of faster access speeds, DMA is memory that by definition is mapped directly from the microprocessor to the memory locations themselves, alleviating the need to go through specific programming and intermediary steps.

Seek time -- the amount of time required for a storage device to find a specific requested record or element of data. Seek times in disk drives are significantly different that DMA for example.

Rotational latency -- One of the three measures of performance for disk drives, rotational latency, seek time, and transfer time are all combined to quantify total disk drive performance.

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Rotational latency is the time required for the disk drives' electronics to place the correct head, sector and track information below the read/write head for accessing.

Transfer time -- in the context of disk drive performance, transfer time is the time needed to read or write data to the hard disk drives' surface, often organized in head, sector and track format......

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