Free Space Management

Duration: 2 min

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Inside: a video lesson and guided study material.

Module outline

  1. English Comprehension/Verbal Ability: Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Vocabulary, Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Subject Verb Agreement (Verb Noun Agreement), Tenses, Verb, Articles, Preposition, Conjunction, Pronoun, Noun, Adjectives, Adverb, Modals, Cloze Test (Cloze Passage), Active Passive Voice (Voice), Direct and Indirect Speech, Sentence Construction
  2. Logical Ability: Coding Decoding, Directions (Direction Test), Analogy, Inequality, Data Sufficiency, Series (Number and Letter Series) (Numerical Relations and Reasoning), Syllogisms, Seating Arrangements, Puzzle Solving (Puzzles), Blood Relations, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Ranking, Order and Sequence, Logical Sequence Of Words, Data Arrangement, Venn Diagram, Calendar, Clock
  3. Quantitative Ability: Logarithm, Permutation and Combination, Probability, Profit and Loss, Speed Time and Distance, Mixture and Alligation, Partnership, Simple Interest and Compound Interest, Percentage, Ratio and Proportion (Ratios), Average, Time and Work, Pipe and Cistern, Number System, Divisibility Rules, HCF LCM, Algebra, Powers and Exponents (Surds and Indices), Mensuration and Geometry, Age Problems, Data Interpretation, Sequence and Series (Series)
  4. Basic Analytical Ability: Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Analytical Reasoning (Counting Figures Reasoning), Cubes & Dices, Selection Decision Table (Decision Making)
  5. Computer Programming: Pseudo Codes, Coding Questions by Yash Sir, C Programming by Yash Sir, Programming in C++, Java, Python for Placements by Yash Sir
  6. DBMS (Computer Science): Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Transaction Management, Concurrency Control, Database Security & Authorization
  7. SQL (Computer Science): SQL
  8. OS (Computer Science): Introduction to OS, Process Management, CPU Scheduling, Deadlock, Process Synchronization, Threads & Process Creation, Memory Management, Virtual Memory, File Management
  9. Computer Networks (Computer Science): 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
  10. Data Structures (Computer Science): Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  11. OOPs (Computer Science): Object Oriented Programming (OOPS)
  12. Software Engineering (Computer Science): Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  13. SVAR Conversational - Spoken English: Communication Assessment
  14. HR Interview: MR & HR Interview Preparation
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video segment focuses on the critical concept of Free-Space Management within operating systems. The instructor, Sanchit Jain Sir, explains the necessity of reusing disk space due to hardware limitations. He introduces the free-space list as the primary data structure used by the system to track available storage. The lecture details the entire lifecycle of a disk block, from its initial availability, through allocation for a new file, to its eventual removal from the list, and finally, its return to the list upon file deletion. This process ensures efficient utilization of limited physical storage resources.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor starts by highlighting the constraint: Since disk space is limited, we need to reuse the space from deleted files for new files, if possible. He then defines the mechanism used to handle this: To keep track of free disk space, the system maintains a free-space list. He clarifies that this list records all free disk blocks—those not allocated to some file or directory. The process for creating a new file is described as a search operation: To create a file, we search the free-space list for the required amount of space and allocate that space to the new file. This section establishes the foundational logic of how the system identifies and assigns storage.

  2. 2:00 – 2:27 02:00-02:27

    The final part of the explanation covers the dynamic updates to the free-space list. The instructor states, This space is then removed from the free-space list immediately after allocation. He then describes the reverse action: When a file is deleted, its disk space is added to the free-space list. This ensures that the list remains current and accurate. The instructor underlines key phrases on the slide such as removed from the free-space list and added to the free-space list to reinforce the bidirectional nature of the management process. This completes the cycle of storage management.

The lecture provides a concise overview of how operating systems manage disk storage. By maintaining a free-space list, the system can efficiently allocate space for new files and reclaim space from deleted ones. The instructor emphasizes the continuous cycle of allocation and deallocation, ensuring that limited disk resources are reused effectively. This fundamental concept is crucial for understanding file system design and storage efficiency.

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