MECH 2301 Lecture Notes - Lecture 6: Application Software
20 May 2018
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MECH 2301 Lecture 6 Notes
Introduction
Storage of Method
• From the perspective of the user, the file management system is one of the most
important and visible features of the operating system.
• Most users’ coads, hether typed ito a coad lie iterface CLI or actiated
with a mouse, are operations on files.
• Many interactions between programs and the operating system are file requests.
• When a user retrieves a document file using the drop-down file menu in a word
processor, the word processor program is using the services of the operating system file
manager to retrieve the document file.
• Even the database management application software requires the services of the file
management system to perform its file storage and retrieval operations.
• It is the file management system software that allows users and programs to store,
retrieve, and manipulate files as logical entities, rather than as physical blocks of binary
data.
• Because of its importance and visibility to the user, we have chosen to discuss the file
management system separately from the rest of the operating system.
• We begin by reviewing the differences between the logical, or user, view of a file and
the physical requirements of its storage and retrieval.
• Next, we show how the file management system accomplishes its mission of providing a
logical file ie to the user ad the user’s progras.
• You will see how logical file system requests are mapped to physical files.
• You will see how files are physically stored and retrieved, and how the logical file
commands that you issue to the operating system are implemented.
• You will see some of the trade-offs that must be made as a result of specific user and
program requirements and the limitations of different file storage methods.
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