Difference between revisions of "File System"
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| + | ===<font color=green>'''File System consists of'''</font>=== | ||
| + | ✦ 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>=== | ||
| + | ✦ File protection | ||
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| + | ✦ The semantics of file sharing | ||
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| + | ===<font color=green>'''File Concept: '''</font>=== | ||
| + | • 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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| + | ! [[Types Of Operating System|Previous Page]] !! [[ICT-Application| Home Page]] !! [[Knowledge and Application| Next Page]] | ||
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| + | |}<div style="text-align:center;font-weight:bold;padding:0.4em 1em 0.3em 1em;-moz-border-radius: 6px;background-color:#47b8b8; ">ICT Applications</div> | ||
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Revision as of 14:03, 24 June 2012
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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.
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