To access data in a hard disk, it requires the time to move the head to A. TASK: the desired track (seek time). Once the head has reached the correct track, we must wait for the desired sector to rotate under the read/write head (rotational latency). The last component of a disk access is the time to transfer a block of bits (transfer time). Your task is to: (1) find out the average seek time, rotational latency, transfer time and controller delay in the given factors: 512B sector, 5400 RPM, 3 ms average seek time, 100 MB/s transfer rate, O.2 ms controller overhead, idle disk. (2) What is the average read time in the given factors. (hint: Average read time = seek time + rotational latency + transfer time + controller delay)
To access data in a hard disk, it requires the time to move the head to A. TASK: the desired track (seek time). Once the head has reached the correct track, we must wait for the desired sector to rotate under the read/write head (rotational latency). The last component of a disk access is the time to transfer a block of bits (transfer time). Your task is to: (1) find out the average seek time, rotational latency, transfer time and controller delay in the given factors: 512B sector, 5400 RPM, 3 ms average seek time, 100 MB/s transfer rate, O.2 ms controller overhead, idle disk. (2) What is the average read time in the given factors. (hint: Average read time = seek time + rotational latency + transfer time + controller delay)
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Transcribed Image Text:To access data in a hard
disk, it requires the time to move the head to
A. TASK:
the desired track (seek time). Once the head
has reached the correct track, we must wait for
the desired sector to rotate under the
read/write head (rotational latency). The last
component of a disk access is the time to
transfer a block of bits (transfer time). Your task
is to: (1) find out the average seek time,
rotational latency, transfer time and controller
delay in the given factors: 512B sector, 5400
RPM, 3 ms average seek time, 100 MB/s
transfer rate, 0.2 ms controller overhead, idle
disk. (2) What is the average read time in the
given factors.
(hint: Average read time = seek time +
rotational latency + transfer time + controller
delay)
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