File Systems

  1. On-Disk File System Implementation
    1. Control Structures
      1. Boot Control Block
        1. Boot Loader Information
          1. Partition Boot Sector
            1. Master Boot Record
            2. Volume Control Block
              1. File System Type Information
                1. Size and Status Information
                  1. Free Block Information
                    1. Root Directory Location
                    2. Directory Structure Implementation
                      1. Linear List Implementation
                        1. Simple Structure
                          1. Search Performance Issues
                          2. Hash Table Implementation
                            1. Fast Lookup
                              1. Collision Handling
                                1. Dynamic Resizing
                                2. B-Tree Implementation
                                  1. Balanced Tree Structure
                                    1. Efficient Search and Update
                                  2. File Control Block Structure
                                    1. Metadata Storage
                                      1. Block Pointer Organization
                                        1. Inode Structure
                                      2. File Allocation Methods
                                        1. Contiguous Allocation
                                          1. Allocation Strategy
                                            1. Advantages
                                              1. Simple Implementation
                                                1. Fast Sequential Access
                                                  1. Minimal Seek Time
                                                  2. Disadvantages
                                                    1. External Fragmentation
                                                      1. File Growth Limitations
                                                        1. Compaction Requirements
                                                      2. Linked Allocation
                                                        1. Basic Linked List Structure
                                                          1. File Allocation Table
                                                            1. FAT Structure
                                                              1. Cluster Chains
                                                                1. End-of-File Markers
                                                                2. Advantages
                                                                  1. No External Fragmentation
                                                                    1. Dynamic File Growth
                                                                    2. Disadvantages
                                                                      1. Poor Random Access
                                                                        1. Reliability Issues
                                                                          1. Space Overhead
                                                                        2. Indexed Allocation
                                                                          1. Single-Level Indexing
                                                                            1. Index Block Structure
                                                                              1. Direct Block Pointers
                                                                              2. Multilevel Indexing
                                                                                1. Indirect Blocks
                                                                                  1. Double Indirect Blocks
                                                                                    1. Triple Indirect Blocks
                                                                                    2. Combined Schemes
                                                                                      1. UNIX Inode Structure
                                                                                        1. Direct and Indirect Pointers
                                                                                          1. Extent-Based Allocation
                                                                                          2. Advantages and Trade-offs
                                                                                            1. Fast Random Access
                                                                                              1. Efficient Small Files
                                                                                                1. Index Block Overhead
                                                                                            2. Free Space Management
                                                                                              1. Bit Vector Method
                                                                                                1. Bitmap Representation
                                                                                                  1. Allocation and Deallocation
                                                                                                    1. Space Efficiency
                                                                                                      1. Search Algorithms
                                                                                                      2. Linked List Method
                                                                                                        1. Free Block Chains
                                                                                                          1. Allocation Process
                                                                                                            1. Fragmentation Issues
                                                                                                            2. Grouping Method
                                                                                                              1. Block Group Organization
                                                                                                                1. Allocation Efficiency
                                                                                                                2. Counting Method
                                                                                                                  1. Run-Length Encoding
                                                                                                                    1. Contiguous Free Block Tracking
                                                                                                                    2. Buddy System
                                                                                                                      1. Power-of-Two Allocation
                                                                                                                        1. Coalescing Algorithm

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                                                                                                                    5. Storage Device Organization

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                                                                                                                    7. File System Performance