Operating Systems - File Allocation Methods - Contiguous, Linked, Indexed
You are designing a file system for a device with very limited memory but frequent random reads of small files. Which allocation method is preferable, and why?
You are designing a file system for a device with very limited memory but frequent random reads of small files. Which allocation method is preferable, and why?
hard🚀 Application Q8 of Q15
Step-by-Step Solution
Solution:
Step 1: Consider memory constraints
Limited memory means metadata overhead must be minimal.Step 2: Evaluate random read needs
Fast random access favors contiguous allocation due to direct block addressing.Step 3: Analyze alternatives
Linked allocation has pointer overhead and slow random access; indexed allocation adds index block overhead.Step 4: Conclude best fit
Contiguous allocation minimizes metadata and supports fast random reads for small files.Final Answer:
Option A -> Option AQuick Check:
Contiguous allocation -> minimal metadata + fast random access [OK]
Quick Trick: Contiguous = minimal metadata + fast random access [OK]
Common Mistakes:
MISTAKES- Assuming linked allocation uses less memory overall
- Overestimating indexed allocation efficiency on small files
- Believing hybrid methods always outperform simple ones
Trap Explanation:
PITFALL- Candidates often overlook metadata overhead impact on limited-memory devices.
Interviewer Note:
CONTEXT- Assesses ability to apply allocation methods to constrained hardware scenarios.
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