List-I (Method) A. Contiguous Allocation B. Linked Allocation C. Indexed Allocation D. Inode System List-II (Structural Implementation) Files occupy linear sequential block chains; fast direct access. Disk blocks contain pointers to next nodes; eliminates external fragmentation. Dedicated index pointer blocks hold all direct data addresses. Multi-level indexed mapping structure used in Unix file systems.

A-1, B-2, C-3, D-4 Explanation: Each file allocation method matches its corresponding structural implementation as follows: A. Contiguous Allocation 1 : Each file occupies a set of contiguous (linear sequential) blocks on the disk, providing fast direct access since disk seeks are minimized. B. Linked Allocation 2 : Each file is a linked list of disk blocks, where each block contains a pointer to the next block, completely eliminating external fragmentation. C. Indexed Allocation 3 : Collects all pointers into a dedicated index block, holding direct data addresses for efficient random access without external fragmentation. D. Inode System 4 : The traditional Unix file system structure that uses direct blocks along with multi-level (single, double, triple) indirect pointer blocks to support variable file sizes. Therefore,

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CUET PG 2026 — operating system os PYQ

CUET PG | operating system os | 2026

List-I (Method)

A. Contiguous Allocation

B. Linked Allocation

C. Indexed Allocation

D. Inode System

List-II (Structural Implementation)

Files occupy linear sequential block chains; fast direct access.

Disk blocks contain pointers to next nodes; eliminates external fragmentation.

Dedicated index pointer blocks hold all direct data addresses.

Multi-level indexed mapping structure used in Unix file systems.

Choose the correct answer: