Operating System Unit 5 Notes AKTU (BCS401)

AKTU · BTECH · Semester 4 · Operating System · Unit 5 · Notes

AKTU Operating System (BCS401) Unit 5 notes for B.Tech Semester 4 – I/O Management and File Systems. Topics: I/O Management, Disk Scheduling, File System…

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Unit 5: I/O Management and File Systems – AKTU syllabus topics

  • I/O Management: I/O Devices and Subsystems, I/O Buffering
  • Disk Scheduling: Disk Storage, Disk Scheduling Algorithms, RAID
  • File System: File Concept and Organization, File Directories and Sharing, File System Implementation, File System Protection and Security

Most asked AKTU PYQ questions from Unit 5

  1. Q3b. Explain the concept of file system management. Also, explain various file allocation and file access mechanisms in details. (10 marks, 2022-23)
  2. Q6b. Consider a disk queue with requests for I/O to blocks on cylinders 47, 38, 121, 191, 87, 11, 92, 10. The C-LOOK scheduling algorithm is used. The head is initially at cylinder number 63, moving towards larger cylinder numbers on its servicing pass. The cylinders are numbered from 0 to 199.… (7 marks, 2024-25)
  3. Q1j. Explain tree level directory structure. (2 marks, 2022-23)
  4. Q3a. Explain the term RAID and its characteristics. Also, explain various RAID levels with their advantages and disadvantages. (10 marks, 2022-23)
  5. Q6b. Suppose the following disk request sequence (track numbers) for a disk with 100 tracks is given: 45, 20, 90, 10, 50, 60, 80, 25, 70. Assume that the initial position of the R/W head is on track 49. Calculate the net head movement using: (i) SSTF (ii) SCAN (iii) CSCAN (iv) LOOK. (10 marks, 2022-23)
  6. Q7b. Explain the followings: (i) Buffering (ii) Polling (iii) Direct Memory Access (DMA). (10 marks, 2022-23)
  7. Q5a. Explain about the concept of File concept. Define in detail about the File organization and access mechanism. (10 marks, 2021-22)
  8. Q5b. Explain file directories and directory structures in operating systems. (7 marks, 2024-25)
  9. Q2e. Compare and contrast different disk storage technologies, such as HDDs and SSDs? (7 marks, 2023-24)
  10. Q7a. Discuss the organization of files within file systems, including contiguous, linked, and indexed allocation methods? (7 marks, 2023-24)

AKTU paper codes: BCS401, KCS401, RCS401

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