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In which scenario is contiguous file allocation most suitable compared to linked or indexed allocation?

easy🔍 Pattern Recognition Q11 of Q15
Operating Systems - File Allocation Methods - Contiguous, Linked, Indexed
In which scenario is contiguous file allocation most suitable compared to linked or indexed allocation?
AWhen files are frequently extended or shrunk dynamically during runtime
BWhen the file system must handle very large files with unpredictable sizes
CWhen fast sequential and direct access to file blocks is required with minimal overhead
DWhen minimizing external fragmentation is the highest priority
Step-by-Step Solution

  1. Step 1: Understand contiguous allocation characteristics

    Contiguous allocation stores all file blocks sequentially on disk, enabling fast sequential and direct access without extra pointers.

  2. Step 2: Analyze when fast sequential and direct access to file blocks is required with minimal overhead

    Fast sequential and direct access is exactly what contiguous allocation optimizes for.

  3. Step 3: Analyze when files are frequently extended or shrunk dynamically during runtime

    Contiguous allocation struggles with dynamic file size changes due to fragmentation and need for contiguous free space.

  4. Step 4: Analyze when the file system must handle very large files with unpredictable sizes

    Large unpredictable files are better handled by linked or indexed allocation to avoid fragmentation and allocation overhead.

  5. Step 5: Analyze when minimizing external fragmentation is the highest priority

    Contiguous allocation tends to cause external fragmentation, so it does not minimize it.

  6. Final Answer:

    Option C -> Option C

  7. Quick Check:

    Contiguous allocation -> fast access but poor flexibility and fragmentation handling.
Quick Trick: Contiguous = fastest direct access but poor flexibility [OK]
Common Mistakes:
MISTAKES
  • Assuming contiguous allocation handles dynamic file sizes well
  • Confusing fragmentation minimization with contiguous allocation benefits
Trap Explanation:
PITFALL
  • Options B and C describe scenarios where linked or indexed allocation is better, tempting candidates who confuse flexibility with speed.
Interviewer Note:
CONTEXT
  • Tests candidate's ability to match file allocation methods to usage scenarios.
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