6. File System Management

File System Manager

A set of OS Services that provides Files and Directories for user applications.

File

A named, ordered collection of information

File System

A set of files and directories contained on a single drive. The raw data on the drive is translated to this abstract view of files and directories by the file system manager according to the specification of the file system standard.

The file manager administers the file system by:

• Storing the information on a device
• Mapping the block storage to a logical view
• Allocating/deallocating storage
• Providing directories

Contents:

• 6.1. File System Abstractions
  • 6.1.1. Physical Hard Drives
  • 6.1.2. Zone Bit Recording
  • 6.1.3. Disk Partitions
  • 6.1.4. Disk Block View
• 6.2. A File
• 6.3. Directories and File System Tables
• 6.4. File System Services
  • 6.4.1. Types of File Access
  • 6.4.2. Permissions
  • 6.4.3. File Descriptors
  • 6.4.4. System Calls
  • 6.4.5. Directory Trees
  • 6.4.6. Path Names
  • 6.4.7. File Object Links
• 6.5. File System Standards
  • 6.5.1. Types of File Systems
  • 6.5.2. FAT
  • 6.5.3. NTFS
  • 6.5.4. Inode
• 6.6. File System Errors
  • 6.6.1. System Inconsistency
  • 6.6.2. Journaled File Systems
  • 6.6.3. Fragmentation
• 6.7. Disk Scheduling
  • 6.7.1. First-Come, First-Served Disk Scheduling
  • 6.7.2. Shortest Seek Time first (SSTF) Disk-Scheduling
  • 6.7.3. SCAN Disk Scheduling
  • 6.7.4. In Class Example