Linked List File Management System

Duration: 2 min

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Inside: a video lesson and guided study material.

Module outline

  1. Quantitative Ability: Speed Mathematics and Basic Mathematics, Percentage, Ratio and Proportion (Ratios), Average, Profit and Loss, Simple Interest and Compound Interest, Time and Work, Pipe and Cistern, Speed Time and Distance, Number System, HCF LCM, Data Interpretation, Age Problems, Mixture and Alligation, Partnership, Algebra, Sequence and Series (Series), Mensuration and Geometry, Arithmetic
  2. Reasoning Ability: Puzzle Solving (Puzzles), Seating Arrangements, Coding Decoding, Blood Relations, Directions (Direction Test), Syllogisms, Data Sufficiency, Ranking, Order and Sequence, Series (Number and Letter Series) (Numerical Relations and Reasoning), Logical Sequence Of Words, Calendar, Clock, Cubes & Dices, Analytical Reasoning (Counting Figures Reasoning), Data Arrangement, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning)
  3. Verbal Ability: Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Vocabulary, Sentence Completion (Fill in the blanks), Active Passive Voice (Voice), Direct and Indirect Speech, Subject Verb Agreement (Verb Noun Agreement), Tenses, Preposition, Articles, Sentence Correction (Error Correction)
  4. Programming Basics (MCQs + Interview): C Programming by Yash Sir, Programming in C++, Java, Python for Placements by Yash Sir
  5. OOPs (MCQs + Interview): Object Oriented Programming (OOPS)
  6. DBMS (MCQs + Interview): Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Transaction Management, Decomposition Properties & 4NF, Concurrency Control, Database Recovery, File Organization & Indexing, Relational Algebra, Database Security & Authorization
  7. SQL (MCQs + Interview): SQL
  8. Operating Systems (MCQs + Interview): Introduction to OS, Process Management, CPU Scheduling, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Process Synchronization, Disc Scheduling, File Management, Security
  9. Computer Networks (MCQs + Interview): Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Security, Mobile Technology, Cloud Computing and IoT, Cyber and Info Security
  10. Coding: Coding Questions by Yash Sir
  11. HR Interview: MR & HR Interview Preparation
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The video introduces the Linked List method for free-space management. The instructor explains that this approach links all free disk blocks together. A pointer to the first free block is kept in a special location on the disk and cached in memory. The first block in the list contains a pointer to the next free block, creating a chain. The lecture references a specific example where blocks 2, 3, 4, 5, 8, 9, 10, 11, 12, 13, 17, 18, 25, 26, and 27 are free, while the rest are allocated. The visual aid shows a disk cylinder with arrows connecting these specific free blocks to illustrate the linked structure.

Chapters

  1. 0:00 – 1:48 00:00-01:48

    The instructor introduces the Linked List approach for free-space management. The slide text states, 'Another approach to free-space management is to link together all the free disk blocks, keeping a pointer to the first free block in a special location on the disk and caching it in memory.' He explains that the first block contains a pointer to the next free disk block. The diagram on the right shows a disk cylinder with a 'free-space list head' pointing to block 2. Arrows connect block 2 to 3, 3 to 4, 4 to 5, and so on, following the sequence of free blocks listed in the text: 2, 3, 4, 5, 8, 9, 10, 11, 12, 13, 17, 18, 25, 26, and 27. The instructor gestures towards the diagram to demonstrate how the blocks are linked sequentially, skipping over the allocated blocks (like 0, 1, 6, 7, etc.). This visualizes the concept of a linked list where each node (free block) points to the next available node. He emphasizes that this structure allows the system to find free space by following the chain of pointers rather than scanning a bitmap.

The lesson effectively demonstrates how a linked list organizes free disk space by chaining free blocks together. By maintaining a head pointer and storing the next block's address within each free block, the system can efficiently traverse available space without needing a separate bitmap or complex structure for every block. This method is particularly useful when free blocks are scattered across the disk, as it avoids the overhead of maintaining a large bitmap for sparse free space. The instructor's use of the disk cylinder diagram helps clarify how the logical link structure maps onto the physical disk layout, showing that the order of blocks in the list does not need to match their physical location on the disk. This flexibility is a key advantage of the linked list approach for free-space management.

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