File Management

Files

Terms Used with Files

Terms Used with Files

File Management System

File System Software Architecture

Device Drivers

Basic File System

Basic I/O Supervisor

Logical I/O

Access Method

Functions of File Management

File Directories

Simple Structure for a Directory

Two-level Scheme for a Directory

Hierarchical, or Tree-Structured Directory

Slide 17

Hierarchical, or Tree-Structured Directory

Hierarchical, or Tree-Structured Directory

File Sharing

Access Rights

Access Rights

Access Rights

Access Rights

Simultaneous Access

Record Blocking Methods - Fixed Blocking

Record Blocking Methods - Variable Blocking:Spanned

Record Blocking Methods - Variable Blocking:UnSpanned

Secondary Storage Management

Preallocation

Portion Size

Methods of File Allocation

Contiguous File Allocation

Methods of File Allocation

Chained File Allocation

Methods of File Allocation

Indexed Allocation with Block Portions

Indexed Allocation - Var Length Portions