Which disk scheduling algorithm is the simplest and processes requests in the order they arrive?

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BlackTom AI · Accepted Answer

The question asks: Which disk scheduling algorithm is the simplest and processes requests in the order they arrive?

First, we acknowledge that the provided data shows the purported answer as 'b. FCFS', but the list of answer options is empty, so we cannot analyze specific alternative choices in this instance. Nevertheless, we can discuss the conceptual reason why FCFS fits the description in the question.

To understand the statement, recall what FCFS stands for: First-Come, First-Served. In this approach, disk I/O requests are handled in the exact order in which they arrive, without reordering based on the physical location of the data on the disk. This makes FCFS the simplest scheduling strategy from an implementation standpoint, because it requires minimal state tracking besides a queue of pending requests and a straightforward, linear processing flow.

Why this option matches the description:
- Simplicity: FCFS does not involve complex decision logic, rotation awareness, or look-ahead calculations. It simply enqueues requests and serves them in sequence, which reduces scheduling overhead and potential for bugs.
- Arrival-order processing: The defining feature is that requests are served in the same order they arrive, assuming no preemption or reordering policies are applied.

Why other potential approaches (in general) might not fit the description as neatly:
- If an algorithm reorders requests for performance (e.g., SSTF which selects the closest request to the current head position, or SCAN/LOOK which move the head in a sweeping pattern), it violates the 'in the order they arrive' aspect, even though such methods can reduce average seek time.
- More sophisticated strategies may optimize throughput or latency but at the cost of added complexity and non-sequential processing order, which contrasts with the simplicity emphasized in the question.

In this context, the core idea is that the simplest behavior—no reordering, strict arrival order—maps directly to FCFS. The absence of alternative options in the provided data means you can rely on this conceptual alignment to judge correctness if options were present.

Which disk scheduling algorithm is the simplest and processes requests in the order they arrive?

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Similar Questions

Which disk scheduling algorithm might lead to a "sweeping" effect where requests are serviced in a patterned manner across the disk?

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