Which file allocation method is best suited for files that require fast sequential access and minimal fragmentation?

easy🔍 Pattern Recognition Q1 of Q15

Operating Systems - File Allocation Methods - Contiguous, Linked, Indexed

ALinked allocation, because it allows easy insertion and deletion of blocks.

BHybrid allocation, combining linked and indexed methods for flexibility.

CIndexed allocation, because it uses an index block to locate file blocks quickly.

DContiguous allocation, because it stores all file blocks sequentially on disk.

Step-by-Step Solution

Solution:

Step 1: Understand access patterns for sequential files
Fast sequential access benefits from blocks stored contiguously, minimizing seek time.
Step 2: Evaluate fragmentation impact
Contiguous allocation minimizes fragmentation for sequential reads, unlike linked which scatters blocks.
Step 3: Compare alternatives
Indexed allocation adds overhead for index lookups, linked allocation causes pointer chasing delays.
Final Answer:
Option D -> Option D
Quick Check:
Contiguous allocation stores blocks sequentially -> fast sequential access [OK]

Quick Trick: Contiguous = sequential speed, minimal fragmentation [OK]

Common Mistakes:

MISTAKES

Trap Explanation:

PITFALL

Candidates often think linked allocation is faster due to pointer simplicity, ignoring seek overhead.

Interviewer Note:

CONTEXT

Tests candidate's understanding of allocation impact on sequential access and fragmentation.

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