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Difference between revisions of "File System"

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===<font color=green>'''File System consists of'''</font>===
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✦ A collection of files
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✦ A directory structure
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✦ (possibly) partitions
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===<font color=green>'''Important Issues '''</font>===
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✦ File protection
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✦ The semantics of file sharing
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===<font color=green>'''File Concept: '''</font>===
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• The operating system provides a uniform logical abstraction for the physical storage of information.
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• Storage devices are nonvolatile.
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• A file is a named collection of related information that is recorded on secondary storage.
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• Contiguous logical address space
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• Types:
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:✦  Data
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:✔ Numeric
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:✔ Character
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:✔ Binary
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:✦ Program
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:✔ Source, object and executable file formats
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===<font color=green>'''File Attributes: '''</font>===
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• '''Name''' - only information kept in human-readable form.
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• '''Identifier''' - a unique tag (i.e., an internal number) that identifies the file within the file system.
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• '''Type''' - needed for systems that support different types.
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• '''Location''' - a pointer to file location on device.
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• '''Size''' - current file size.
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• '''Protection'''- controls who can do reading, writing, executing.
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• '''Time, date, and user identification''' - data for protection, security, and usage monitoring.
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• Information about files are kept in the directory structure, which is maintained on the disk.
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[[Category:TOPICS]]

Revision as of 14:03, 24 June 2012

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ICT Applications

File System consists of

✦ A collection of files

✦ A directory structure

✦ (possibly) partitions

Important Issues

✦ File protection

✦ The semantics of file sharing

File Concept:

• The operating system provides a uniform logical abstraction for the physical storage of information.

• Storage devices are nonvolatile.

• A file is a named collection of related information that is recorded on secondary storage.

• Contiguous logical address space

• Types:

✦ Data
✔ Numeric
✔ Character
✔ Binary
✦ Program
✔ Source, object and executable file formats

File Attributes:

Name - only information kept in human-readable form.

Identifier - a unique tag (i.e., an internal number) that identifies the file within the file system.

Type - needed for systems that support different types.

Location - a pointer to file location on device.

Size - current file size.

Protection- controls who can do reading, writing, executing.

Time, date, and user identification - data for protection, security, and usage monitoring.

• Information about files are kept in the directory structure, which is maintained on the disk.







Previous Page Home Page Next Page
ICT Applications