chapter10 - Objectives Learn what a file system does...

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Connecting with Computer Science 2 Objectives Learn what a file system does Understand the FAT file system and its advantages and disadvantages Understand the NTFS file system and its advantages and disadvantages Compare various file systems
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Connecting with Computer Science 3 Objectives (continued) Learn how sequential and random file access work See how hashing is used Understand how hashing algorithms are created
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Connecting with Computer Science 4 What Does a File System Do? Responsible for creating, manipulating, renaming, copying, and removing files to and from a storage device Organizes files into common storage units called directories Keeps track of where files and directories are located
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Connecting with Computer Science 5 Figure 10-1: Files and directories in a file system are similar to documents and folders in a filing cabinet
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Connecting with Computer Science 6 Storage Mediums A hard disk, or drive, is the most common storage medium for a file system Physically organized into tracks and sectors Read/write heads move over specified areas of the hard disks to store (write) or retrieve (read) data Random access device Can read or write data directly anywhere on the disk Faster than sequential access, which reads and writes from beginning to end Makes use of the file system to organize files
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Connecting with Computer Science 7 Figure 10-3 Hard disk platters are divided into tracks and sectors and read/write heads store and retrieve data
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Connecting with Computer Science 8 File Systems and Operating Systems The type of file management system is dependent on the operating system FAT (file allocation table) Used from MS-DOS to Windows ME NTFS (New Technology File System) Default for Windows NT through Windows 2003 Unix and Linux support several file systems XFS, JFS, ReiserFS, ext3, and others HFS+ The current Mac OS X file system
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Connecting with Computer Science 9 FAT Groups hard drive sectors into clusters Increases performance by organizing blocks of sectors contiguously Maintains the relationship between files and clusters being used for the file Clusters have two entries in the table Current cluster information Link to the next cluster or a special code indicating it is the last cluster Keeps track of writable clusters and bad clusters
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Connecting with Computer Science 10 Figure 10-4 Sectors are grouped into clusters on a hard disk
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Connecting with Computer Science 11 FAT (continued) Organizes the hard drive into Partition boot record Contains information on how to access the volume with a file system Main and backup FAT If an error occurs in reading the main FAT, the backup is copied to the main to ensure stability Root directory Contains entries for every file and folder in the directory
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Connecting with Computer Science 12 Figure 10-5 Typical FAT file system
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chapter10 - Objectives Learn what a file system does...

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