File Management Overview
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Questions and Answers

Which layer of the File Management System Structure is responsible for managing buffer memory and cache?

  • File Organization Module Layer
  • Basic File System Layer (correct)
  • Physical Hardware Device Layer
  • I/O Control Interface Layer

    • In a two-level directory structure, what is maintained that contains one entry for each user?

  • Access Rights Registry
  • User Management Table
  • Master Block (correct)
  • Directory Index

    • Which type of directory structure allows for the creation of sub-directories within directories?

  • Two-level directory structure
  • Single-level directory structure
  • Tree-structured directory structure (correct)
  • Flat file directory structure

    • What is the main benefit of data compression?

    <p>Reduction in the amount of bits required to represent data</p> Signup and view all the answers

    The layer that manages the meta data information in the File Management System Structure is known as?

    <p>Logical File System Layer</p> Signup and view all the answers

    Which of the following is NOT a type of directory structure?

    <p>Hierarchical directory structure</p> Signup and view all the answers

    In which layer does the actual hardware device reside within the File Management System Structure?

    <p>Physical Hardware Device Layer</p> Signup and view all the answers

    What is a primary purpose of compressing data?

    <p>To save storage capacity and reduce costs</p> Signup and view all the answers

    What does the File Organization Module Layer primarily maintain information about?

    <p>File organization and metadata</p> Signup and view all the answers

    Which of the following best describes a single-level directory structure?

    <p>All files are placed in a single directory</p> Signup and view all the answers

    What is a significant disadvantage of using an index in a file management system?

    <p>It requires additional storage.</p> Signup and view all the answers

    Which type of file is used to represent physical devices in an operating system?

    <p>Special files</p> Signup and view all the answers

    What operation must be performed on a file to free up internal storage after finishing data access?

    <p>Close</p> Signup and view all the answers

    How are data handled in character special files?

    <p>Character by character</p> Signup and view all the answers

    What is the function of the append operation in file management?

    <p>To add data only at the end of the file</p> Signup and view all the answers

    Which of the following file types contains user information and allows operations such as add or modify?

    <p>Ordinary files</p> Signup and view all the answers

    What is the primary purpose of a directory file in an operating system?

    <p>To organize and hold multiple files</p> Signup and view all the answers

    Which file operation involves specifying a position for random data access?

    <p>Seek</p> Signup and view all the answers

    Which of the following best describes the nature of block special files?

    <p>Data is managed in discrete blocks</p> Signup and view all the answers

    What type of file would you find when looking at an organized list of files within a folder?

    <p>Directory files</p> Signup and view all the answers

    Which access method is considered the most primitive and involves accessing files sequentially one record at a time?

    <p>Sequential File Access</p> Signup and view all the answers

    What is the primary benefit of using Direct File Access compared to Sequential File Access?

    <p>Accessing data from any location quickly</p> Signup and view all the answers

    Which of the following best describes Indexed File Access?

    <p>Access method combining sequential and direct access using an index</p> Signup and view all the answers

    What is a significant drawback of using Sequential File Access?

    <p>It is unsuitable for large files and random access.</p> Signup and view all the answers

    Which file access method would likely be most beneficial for applications requiring quick retrieval of non-sequential records?

    <p>Direct (Random) File Access</p> Signup and view all the answers

    Within file management, what does the term 'file types' refer to?

    <p>Different categories of files based on their functionality and data format</p> Signup and view all the answers

    What does a File Management System primarily control?

    <p>Access, creation, modification, and deletion of files</p> Signup and view all the answers

    In the context of file management, what is a common technique used for reducing the size of files?

    <p>Data Compression</p> Signup and view all the answers

    What is a disadvantage commonly associated with Direct File Access?

    <p>Increased complexity in implementation</p> Signup and view all the answers

    Which aspect of the File Management System deals with organizing files within a storage structure?

    <p>Directory Structure</p> Signup and view all the answers

    Study Notes

    File Management Overview

    • File Manager is the software responsible for creating, deleting, modifying, and controlling file access. It also supports libraries of programs for online users, spooling, and interactive computing.

    File Concept

    • Files are the fundamental building blocks of operating systems, storing information and data permanently.
    • Operating systems don't care about the contents within files; they map files to physical devices.
    • A program (file) represents a program and its data; the output of a program is an executable file.

    File Access Methods

    • File access mechanisms define how records within a file are accessed.
    • Sequential access involves accessing records in order, from the beginning to the end.
      • Advantages: simple and easy to implement.
      • Disadvantages: slow and inefficient for random access, especially with large files.
    • Direct access (random access) allows direct access to any record within the file without processing preceding records.
      • Advantages: speed and efficiency in random access
      • Disadvantages: more complex and difficult to implement than sequential access.
    • Indexed access combines sequential and direct access through an index file mapping logical keys to physical addresses.
      • Advantages: speed and efficiency for both random and sequential access.
      • Disadvantages: requires additional storage for the index, increasing system complexity and cost.

    File Types

    • File types allow operating systems to distinguish between different file types (text, source, binary, etc.).
    • Many operating systems support diverse file types.
      • Ordinary files hold user information (text, databases, programs).
      • Directory files list files and related information (equivalent to "folders").
      • Special files represent physical devices (disks, terminals, printers).
        • Character special files handle data character-by-character (terminals, printers).
        • Block special files handle data in blocks (disks, tapes).

    File Operations

    • Create: Generates an empty file.
    • Delete: Removes a file, freeing up disk space.
    • Open: Prepares a file for use.
    • Close: Releases resources associated with a file.
    • Read: Retrieves data from a file.
    • Write: Writes data to a file, typically at the current position.
    • Append: Adds data to the end of a file.
    • Seek: Positions the file pointer to a specific location.
    • Rename: Changes a file's name.

    Directory Structure

    • Directories list files, containing information like file names, types, sizes, ownership, permissions, and timestamps.
    • Types:
      • Single-level: All files in one directory.
      • Two-level: A master directory containing subdirectories.
      • Tree-structured: Directories can contain files and subdirectories, creating a hierarchical structure.

    File Management System Structure

    • Layered file systems organize the interaction between application programs and devices using multiple layers: application program, logical file system, file organization module, basic file system, I/O control interface, and physical hardware.

    Data Compression

    • Data compression reduces the amount of bits required to represent data, saving storage capacity, speeding up file transfer, and lowering costs for hardware and network bandwidth.
    • Compression algorithms determine how data can be shrunk.
    • When transferring data over the internet, files are often compressed (e.g., ZIP, GZIP) for efficient transmission.

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    Related Documents

    File Management PDF

    Description

    This quiz covers the essential concepts of file management, including the role of file managers and different file access methods. Understand how files are integral to operating systems and the implications of sequential versus direct access. Test your knowledge on these key topics in computing.

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