Skip to content
Rounder
Start
BCA-205N · Operating System
Unit 5

File Systems, Secondary Storage Management & Disk Scheduling

Sign in to save
Unit 5 Learning Hub

File Systems, Secondary Storage Management & Disk Scheduling

Official MJPRU BCA Unit 5: File Systems, Secondary Storage Management & Disk Scheduling for BCA-205N (Operating System).

Syllabus Topics:File Concept: Logical Storage Abstraction, File Attributes (Name, Identifier, Type, Location, Size, Protection)File Operations: Create, Open, Read, Write, Seek/Reposition, Delete, Truncate, CloseFile Access Methods: Sequential Access (Tape/Card Model), Direct / Random Access (Fixed-Length Records), Indexed AccessDirectory Structures: Single-Level Directory, Two-Level Directory, Tree-Structured Hierarchical DirectoryAcyclic-Graph & General Graph Directories: Hard Links vs Symbolic (Soft) Links, Shared Subdirectories, Reference CyclesFile System Mounting & File Protection: Access Control Lists (ACL), Unix Permission Bits (Read, Write, Execute for Owner, Group, Others)File Allocation Methods: Contiguous Allocation (External Fragmentation, Compaction, File Growth Issues)Linked Allocation: Pointer-Chained Disk Blocks, No External Fragmentation, Elimination of Random AccessIndexed Allocation: Direct Index Blocks, Multi-Level Indexing, Combined Schemes (UNIX Inode Architecture)Free Space Management: Bit Vector (Bitmap), Linked Free List, Grouping, Counting MethodsPhysical Disk Geometry: Platters, Surfaces, Tracks, Sectors, Cylinders, Read/Write Heads, Rotational Latency, Seek TimeDisk Head Scheduling Concept: Minimizing Seek Time and Head Travel Distance Across CylindersFirst-Come, First-Served (FCFS) Disk Scheduling: Algorithm, Head Traversal Calculation, Fair but Suboptimal PerformanceShortest Seek Time First (SSTF) Disk Scheduling: Algorithm, Head Traversal Calculation, Starvation Risks for Outlying RequestsSCAN (Elevator) Scheduling: Unidirectional Cylinder Traversal to Boundary, Boundary ReversalC-SCAN (Circular SCAN) Scheduling: Unidirectional Sweep with Immediate Return to Start, Uniform Waiting Time DistributionLOOK and C-LOOK Disk Scheduling: Optimizing SCAN and C-SCAN by Limiting Sweep to Final Active Request
1
Card 1 of 5·+0 XP earned

Introduction to Computers & The IPO Cycle

💻
Topic 1 · The foundation of modern computing

Introduction to Computers & The IPO Cycle

+25 XP
🐾

Ready to master this concept? Give it a quick read & tap the check!

💡 The Big Picture:A computer is an electronic system that takes raw data as Input, processes it under programmed logic, and produces meaningful Information as Output.
🍪 Everyday Analogy:Think of baking cookies: Flour & Sugar (Input) ➔ The Oven (Processing) ➔ Warm Delicious Cookie (Output)! 🍪
Key Exam Takeaways
  • ·Data = Raw, unprocessed facts without context (e.g. 42, 'apple').
  • ·Information = Structured data with meaning (e.g. 'Temperature: 42°C').
  • ·Hardware is what you can touch; Software is the instructions running inside.
Instant Knowledge Check
+20 XP

Which of the following represents unprocessed raw facts?

1/5