🏠 Home > Operating System > 10. Mass Storage Structure > Extensions of RAID structure
← Back to 10. Mass Storage Structure

📝 Extensions of RAID structure

📖 From Operating System • 10. Mass Storage Structure • 6 questions available

Practice MCQs for Extensions of RAID structure. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-26

1
Easy Questions
3
Medium Questions
2
Hard Questions

📝 Sample Questions

Q1. Using the C‑SCAN algorithm, a disk has cylinders numbered 0–199, the read‑head starts at cylinder 53, and the pending requests are 98, 183, 37, 122, 14, 124, 65, and 67. What is the total number of cylinders the head must travel to service all requests?

🔹 A. 382
🔹 B. 350
🔹 C. 410
🔹 D. 300

💡 Difficulty: easy | ✅ Correct: A

Q2. How does the C‑LOOK scheduling algorithm differ from the standard C‑SCAN algorithm in terms of head movement after servicing the last request in one direction?

🔹 A. C‑LOOK continues to the maximum cylinder before reversing, while C‑SCAN stops at the last request.
🔹 B. C‑LOOK stops at the last request in the current direction and jumps directly to the first request, whereas C‑SCAN moves to the physical end of the disk before wrapping.
🔹 C. C‑LOOK reverses direction without any jump, while C‑SCAN always jumps to the start.
🔹 D. C‑LOOK services requests randomly, while C‑SCAN follows a fixed order.

💡 Difficulty: medium | ✅ Correct: B

Q3. Why does the LOOK algorithm generally achieve a lower average seek time than the traditional SCAN algorithm on workloads with clustered requests?

🔹 A. LOOK ignores the direction of the head, reducing movement.
🔹 B. LOOK limits movement to the outermost cylinder, minimizing travel.
🔹 C. LOOK stops the head at the last request in each direction instead of sweeping to the extreme cylinder, eliminating unnecessary travel.
🔹 D. LOOK processes requests in a random order, which statistically reduces distance.

💡 Difficulty: hard | ✅ Correct: B

⬆️ View all questions in the quiz below

🔗 Related Topics

📝 Magnetic disks📝 Solid state disks📝 Magnetic tapes📝 Disk Structure📝 Host attached storage
🚀 Start Quiz 📝 Practice Mode