ENVS 1500 Chapter Notes - Chapter 19: Microsoft Scandisk

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ENVS 1500 Chapter 19 Notes – Summary
Introduction
Program Services
• Status information can be particularly important to personal computer users who must
maintain their own systems.
• For example, status information allows the user to ascertain the condition of a disk
• To determine the number of bad blocks on the disk or to analyze and reduce the
fragmentation that is present on the disk.
• For example, Windows provides the SCANDISK and DEFRAGS commands for this
purpose.
• One of the most important user functions provided by the operating system is actually
invisible to the user.
• The operatig syste provides a variety of services directly to the users progras.
• The most important of these are the I/O and file services.
• Also important are requests for the use of system resources that a program needs
• Such as additional memory or larger blocks of time and GUI services that support
coo look ad feel
• Typical program services can be used to retrieve a file, to save a file, or to locate the
individual blocks of a file.
• The program services can read one or a few particular blocks of a file into a designated
user area of memory.
• Most program service facilities can keep track of several files at once.
• Typical program services also allow an application program to bypass the file system
under certain conditions and to perform I/O directly to disk and other I/O devices.
• For example, the program could request a service that retrieves a particular block on the
disk.
• This type of service might be important to a program that attempts to repair damaged
data files, for example.
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