DISK SCHEDULING IN OS | OPERATING SYSTEM | LECTURE 05 BY MS. SHRUTI JAIN | AKGEC

Item: DISK SCHEDULING IN OS | OPERATING SYSTEM | LECTURE 05 BY MS. SHRUTI JAIN | AKGEC
Rating: 4
Author: PostSingularity Institute

by Ms. Shruti Jain

Formal & Physical Sciences Computing & Cybersecurity UYComputer science UYDSystems analysis and design

🎙 Ms. Shruti Jain 👥 22K 📅 August 19, 2026 ⏱ 22 min 👁 0 📄 tutorial 🧭 2026-08-19

Available in: English (current) Français

Keywords

disk schedulingFCFSSSTFSCANC-SCAN

Summary

This lecture by Ms. Shruti Jain, from Ajay Kumar Garg Engineering College, provides a comprehensive introduction to disk scheduling in operating systems. It begins by explaining the structure of storage devices and the importance of efficient disk I/O management. The lecture defines key concepts such as seek time and rotational latency, and emphasizes the goal of minimizing seek time to improve performance. The core of the lecture is a detailed walkthrough of four disk scheduling algorithms: First-Come, First-Served (FCFS), Shortest Seek Time First (SSTF), SCAN (elevator algorithm), and C-SCAN. For each algorithm, the instructor uses a consistent example with a request queue and a starting head position to illustrate the order of service and calculates the total seek distance. The lecture highlights the trade-offs between algorithms, such as the high seek time of FCFS and the potential for starvation in SSTF. The SCAN and C-SCAN algorithms are presented as more efficient alternatives that reduce seek time by moving the disk arm in a systematic manner. The lecture concludes by noting that the choice of algorithm depends on the nature of the request queue and the goal of reducing total seek distance.

191 words

Critical Evaluation

Value of the Information & Strength of the Argument

The lecture provides a solid, step-by-step explanation of disk scheduling algorithms, which is valuable for students learning operating systems. The use of a consistent example with a specific request queue and head position allows for a clear comparison of the algorithms’ performance. The calculations of total seek distance are presented in a transparent manner, reinforcing the concepts. The argumentation is logical and builds from basic definitions to more complex algorithms. The instructor effectively explains the rationale behind each algorithm, such as why SSTF can lead to starvation and why SCAN behaves like an elevator. However, the lecture could be strengthened by discussing the practical implications of these algorithms in modern systems and by providing more context on when each algorithm is most suitable.

Scientific Rigor, Source Quality, Title Accuracy

The content is scientifically accurate and aligns with standard operating system textbooks, such as Silberschatz, Galvin, and Gagne’s ‘Operating System Concepts’. The lecture does not cite specific sources, but the material is well-established knowledge in the field. The title accurately reflects the content, and the lecture is well-structured for an educational purpose. The description provides links to the institution’s website and a playlist of related lectures, which are relevant resources for further study. The lecture’s rigor is adequate for an introductory course, but it does not delve into advanced topics or recent research.

231 words

Title / Content Match

The title accurately reflects the content: a lecture on disk scheduling in operating systems.

Quality & Reliability

7/10

The lecture provides a clear and accurate explanation of disk scheduling algorithms, with worked examples and calculations. The content is standard and aligns with established OS textbooks. However, the presentation is somewhat informal and lacks citations to primary sources, and the audio transcription contains minor inaccuracies.

Key Moments

Markers derived by PSI from the transcript: the creator did not define chapters.

Cited Sources

AKGEC Official Website — Institution's official website, providing context for the lecture series.
Operating System Playlist — Playlist of related lectures on Operating Systems by the same instructor.

Concurring Sources

Disk scheduling (Wikipedia) — Confirms the definitions and examples of FCFS, SSTF, SCAN, and C-SCAN algorithms.

Contribution & Novelties

The lecture provides a clear and structured introduction to disk scheduling algorithms, using a consistent example to illustrate the mechanics and performance of each algorithm. It is particularly useful for students preparing for university exams, as it breaks down the calculations step-by-step. The lecture does not introduce new research or novel perspectives, but it serves as an effective educational resource.

Pour aller plus loin :

Disk scheduling (Wikipedia) — Provides a comprehensive overview of disk scheduling algorithms, including those not covered in the lecture.
Operating System Concepts (Silberschatz et al.) — The standard textbook reference for operating systems, offering deeper insights into disk management.
Elevator algorithm (Wikipedia) — Explains the SCAN algorithm in the context of elevator movement, which is a useful analogy.

123 words

Radar Profile

The radar profile shows a balanced performance across all dimensions, with slightly higher scores in information quality and reliability, reflecting the accurate and well-structured content. The lower score in technical depth indicates that the lecture is introductory and does not explore advanced topics or recent developments.

Reliability 7/10