Disk Scheduling in Operating System | FCFS, SSTF, SCAN, LOOK, C-LOOK | Examples скачать в хорошем качестве

Disk Scheduling in Operating System | FCFS, SSTF, SCAN, LOOK, C-LOOK | Examples

   • OS IN 7 HOURS: Operating System ONE SHOT L...   Master the fundamentals of Disk Management in Operating Systems. This video provides a complete guide to magnetic disk architecture, including platters, surfaces, tracks, and sectors, and explains all major disk scheduling algorithms with step-by-step numerical examples. We break down the components of disk access time (seek time, rotational latency, transfer time) and show how to calculate total disk capacity. You'll learn how algorithms like FCFS, SSTF, SCAN, LOOK, C-SCAN, and C-LOOK optimize disk performance by minimizing seek time, and understand their trade-offs in terms of fairness and efficiency. Video Timestamps & Chapters: 00:00 - Introduction to Disk Management in OS 01:05 - Disk Architecture: Platters, Surfaces, Tracks, Sectors 07:20 - Disk Access Time Components: Seek Time, Rotational Latency, Transfer Time 10:57 - Disk Scheduling Algorithms: Purpose and Goals 11:21 - FCFS Algorithm - Simple but Inefficient 15:45 - SSTF Algorithm - Shortest Seek Time First (Starvation Problem) 17:51 - SCAN Algorithm - The Elevator Algorithm 19:36 - LOOK Algorithm - Efficient Version of SCAN 20:26 - C-SCAN Algorithm - Circular SCAN for Uniform Service 21:50 - C-LOOK Algorithm - Most Practical and Efficient 22:58 - IMPORTANT POINTS Key Topics Covered: Disk Architecture: The hierarchical structure from platters down to sectors where data is stored. Disk Capacity Calculation: How to calculate total storage using powers of 2 for platters, surfaces, tracks, and sectors. Disk Access Time: The three main components that contribute to data retrieval delays and how to calculate them. Disk Scheduling Algorithms: FCFS (First-Come-First-Serve): Simple but poor performance due to zigzag movement. SSTF (Shortest Seek Time First): Efficient but can cause starvation for outer/inner track requests. SCAN & C-SCAN: Fair algorithms that service requests along one direction (elevator algorithm). LOOK & C-LOOK: More efficient versions that only go as far as the last request. Exam Focus: Essential for GATE, UGC NET, and university exams where disk scheduling numerical problems are frequently asked. Understand how operating systems manage one of the slowest components of a computer system to improve overall performance.