chapter
    File Systems and Storage Allocation Short Notes for GATE CS

    File Systems and Storage Allocation short notes for GATE CS: 3 study cards covering concepts, formulas, shortcuts and exam traps, plus solved practice questio

    file systems and storage allocation short notes

    Quick Revision: File Allocation Cheat Sheet

    Quick Revision Cheat Sheet

    Feature Contiguous Linked
    Mapping Adjacent Chained
    External Frag. Yes No
    Internal Frag. No Yes
    Random Access
    Dir Entry Start + Len Start only

    Disk Accesses (Insert at in -block file)

    Contiguous:
    Linked:

    Linked Fragmentation Math



    Quick Revision: Directory Operations

    Quick Revision

    1
    Directory: Maps file names to metadata (FCB/inode).
    2
    Presence Check: Looking for a file. Can stop early upon finding it.
    3
    Absence Check: Proving a file doesn't exist. Must scan all entries.
    4
    Linear List: Create/Rename require uniqueness Full scan. Delete/Open Can stop.
    5
    Hash Tables: average, but poor hash functions degrade to .

    Final Cheat Sheet: Free-Space Management

    Quick Revision Cheat Sheet

    Bitmap Method
    Overhead = bits. Best for contiguous.
    Linked List Method


    Blocks =
    Crucial Exam Rules
    - 1 GB = bytes (Binary prefix).
    - Always subtract the 'next' pointer from block capacity.
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    File Systems and Storage Allocation Short Notes for GATE CS

    File Systems and Storage Allocation short notes for GATE CS: 3 study cards covering concepts, formulas, shortcuts and exam traps, plus solved practice questions.

    Quick Revision: File Allocation Cheat Sheet

    Quick Revision Cheat Sheet

    Feature Contiguous Linked
    Mapping Adjacent Chained
    External Frag. Yes No
    Internal Frag. No Yes
    Random Access
    Dir Entry Start + Len Start only

    Disk Accesses (Insert at in -block file)

    Contiguous:
    Linked:

    Linked Fragmentation Math



    Quick Revision: Directory Operations

    Quick Revision

    1
    Directory: Maps file names to metadata (FCB/inode).
    2
    Presence Check: Looking for a file. Can stop early upon finding it.
    3
    Absence Check: Proving a file doesn't exist. Must scan all entries.
    4
    Linear List: Create/Rename require uniqueness Full scan. Delete/Open Can stop.
    5
    Hash Tables: average, but poor hash functions degrade to .

    Final Cheat Sheet: Free-Space Management

    Quick Revision Cheat Sheet

    Bitmap Method
    Overhead = bits. Best for contiguous.
    Linked List Method


    Blocks =
    Crucial Exam Rules
    - 1 GB = bytes (Binary prefix).
    - Always subtract the 'next' pointer from block capacity.

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