Compare and contrast between linked and indexed disk allocation strate

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Module 6: I/O & File Management

20247m

Compare and contrast between linked and indexed disk allocation strategies.

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Linked vs Indexed Allocation

Linked: each block holds pointer to next, no external fragmentation, sequential access ok, random slow, pointer overhead, reliability if pointer lost.
Indexed: index block holds pointers to all blocks, supports direct access, overhead index block, size limited. Indexed better for large random files, linked simpler for sequential.

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PreviousGiven five memory partition of 100 KB, 500 KB, 200 KB, 300 KB, and 600 KB(in order), how would the first-fit and best-fit algorithms place processes of 212 KB, 417 KB, 112 KB, and 426 KB (in order)? Which algorithm makes the most efficient use of memory?NextSuppose that a disk drive has 5000 cylinders, numbered 0 to 4999. The drive is currently serving a request at cylinder 143, and the previous request was at cylinder 125. The queue of pending request, in FIFO order, is: 86, 1470, 913, 1774, 948, 1509, 1022, 1750, 130 Starting from the current head position, applying Shortest-seek-time-first algorithm find what is the total distance (in cylinders) that the disk arm moves to satisfy all the pending requests.

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