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We are dealing with a magnetic hard disk. The disk has 8800 cylinders. Each track contains 850 sectors. Each sector contains 4 KiB (= 4096 B). (a) Vida determined the capacity of the disk, which is 513.60 GiB (she rounded the result slightly). How many heads does that disk contain? (b) The disk arm needs 2.5 ms to move to an adjacent cylinder. Vida calculated that we need aproximately 19.22 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 8800 cylinders. Each track contains 850 sectors. Each sector contains 4 KiB (= 4096 B). (a) Vida determined the capacity of the disk, which is 513.60 GiB (she rounded the result slightly). How many heads does that disk contain? (b) The disk arm needs 2.5 ms to move to an adjacent cylinder. Vida calculated that we need aproximately 19.22 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
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We are dealing with a magnetic hard disk. The disk has 8800 cylinders. Each track contains 850 sectors. Each sector contains 4 KiB (= 4096 B). (a) Vida determined the capacity of the disk, which is 513.60 GiB (she rounded the result slightly). How many heads does that disk contain? (b) The disk arm needs 2.5 ms to move to an adjacent cylinder. Vida calculated that we need aproximately 19.22 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 8800 cylinders. Each track contains 850 sectors. Each sector contains 4 KiB (= 4096 B). (a) Vida determined the capacity of the disk, which is 513.60 GiB (she rounded the result slightly). How many heads does that disk contain? (b) The disk arm needs 2.5 ms to move to an adjacent cylinder. Vida calculated that we need aproximately 19.22 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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