MECH 2301 Lecture Notes - Lecture 38: Disk Controller, Computer File
22 May 2018
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MECH 2301 Lecture 38 Notes
Introduction
Paper Filed Alphabetically
• You might choose to create a single file system with the papers filed alphabetically by
title.
• Or, you might create a number of file systems, where each file box contains the papers
for a particular course sequence.
• The computer file system works similarly.
• The user might face a single file system that hides all of the storage details.
• Alternatively, she may be working on a system where each I/O device is catalogued
individually.
• An important (and, it turns out, reasonable) assumption is that it is possible to group the
logical view of the files differently from that of physical storage as a means to achieve an
optimum solution.
• The file management component of the operating system provides the connectivity
between the two.
• The primary methods used for grouping files are based on dividing and organizing file
systems into disks, partitions, volumes, storage pools, and multiple, separate file
systems.
• Some designers carry the concept of separate file systems even further into virtual file
systems.
• As an example, an inexpensive desktop computer might have a single disk and a CD
drive or DVD drive.
• By default, Windows would treat this simple configuration as two file systems, one for
each disk, probably labeled C: and D:, respectively.
• In this situation, each disk has a single file and directory system, logically facing the user,
and a single I/O interface facing the disk controller for each device.
• This configuration is illustrated
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