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We are dealing with a magnetic hard disk. The disk has 15 500 cylinders and 20 heads. Each sector contains 2 KiB (= 2048 B). (a) Vida determined the capacity of the disk, which is 1082.04 GiB (she rounded the result slightly). Suppose that every track contain the same number of sectors. How many sectors does a track contain? (b) The disk arm needs 1.7 ms to move to an adjacent cylinder. Vida calculated that we need aproximately 34.13 minutes to read the entire disk. At what speed does the disk rotate (give the result in RPM)? (c) Suppose that we now change the speed of rotation to 7200 RPM. What is the maximum data transfer rate (between the disk and the controller's buffer)?

We are dealing with a magnetic hard disk. The disk has 15 500 cylinders and 20 heads. Each sector contains 2 KiB (= 2048 B). (a) Vida determined the capacity of the disk, which is 1082.04 GiB (she rounded the result slightly). Suppose that every track contain the same number of sectors. How many sectors does a track contain? (b) The disk arm needs 1.7 ms to move to an adjacent cylinder. Vida calculated that we need aproximately 34.13 minutes to read the entire disk. At what speed does the disk rotate (give the result in RPM)? (c) Suppose that we now change the speed of rotation to 7200 RPM. What is the maximum data transfer rate (between the disk and the controller's buffer)?

Database System Concepts
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
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We are dealing with a magnetic hard disk. The disk has 15 500 cylinders and 20 heads. Each sector contains 2 KiB (= 2048 B). (a) Vida determined the capacity of the disk, which is 1082.04 GiB (she rounded the result slightly). Suppose that every track contain the same number of sectors. How many sectors does a track contain? (b) The disk arm needs 1.7 ms to move to an adjacent cylinder. Vida calculated that we need aproximately 34.13 minutes to read the entire disk. At what speed does the disk rotate (give the result in RPM)? (c) Suppose that we now change the speed of rotation to 7200 RPM. What is the maximum data transfer rate (between the disk and the controller's buffer)?
Transcribed Image Text:We are dealing with a magnetic hard disk. The disk has 15 500 cylinders and 20 heads. Each sector contains 2 KiB (= 2048 B). (a) Vida determined the capacity of the disk, which is 1082.04 GiB (she rounded the result slightly). Suppose that every track contain the same number of sectors. How many sectors does a track contain? (b) The disk arm needs 1.7 ms to move to an adjacent cylinder. Vida calculated that we need aproximately 34.13 minutes to read the entire disk. At what speed does the disk rotate (give the result in RPM)? (c) Suppose that we now change the speed of rotation to 7200 RPM. What is the maximum data transfer rate (between the disk and the controller's buffer)?
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