Which of the following relationships holds for non-random-access memory, where…
2017
Which of the following relationships holds for non-random-access memory, where Tₙ = average time to read or write n bits, Tₐ = average access time, n = number of bits and r = transfer rate in bits per second?
Answer: B. Tₙ = Tₐ + n/r — The correct answer is B. For non-random-access memory (like magnetic disks or tapes), the total average time to read or write n bits (Tn) is the sum of the…
- A.
Tₐ = Tₙ + n/r
- B.
Tₙ = Tₐ + n/r
- C.
Tₐ = Tₙ + r/n
- D.
Tₙ = Tₐ + r/n
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Correct answer: B
The correct answer is B. For non-random-access memory (like magnetic disks or tapes), the total average time to read or write n bits (Tn) is the sum of the average access time (Ta) required to position the head, and the transfer time, which is n/r (number of bits divided by the transfer rate). Thus, Tn = Ta + n/r.
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