FILE SYSTEMOf

Window XPPresented By

Ehtisham Ali

Outline1. Windows File system

3. File Naming Convention

2. Hardware Support

4. File Extensions

Every Operating system has its own file system.

File System works as an interface between user and storage devices.

It is a record of addresses of files stored on a storage media.

It helps Operating System to retrieve required file whenever user asks for it.

Windows File System

Recommended File System for Window XP is NTFS

NTFS – New Technology file system

Windows File System (contd…)

Other supported file systems:

FAT or FAT16 – File Allocation Table

FAT 32

CDFS – Compact Disk File System

UDF – Universal Disk Format (for DVD’s)

Hard disk support for FAT or FAT16 File System.

65,535 Entries in Table

1 Entry = 1 Block*

1 Block* = 32 KB of Data

65,535 x 32 = 2097120 KB of Data (approx. 2GB)

Finally it means that FAT/FAT16 file system has a support for only upto

2 GB of Hard disk.Block – It is a area of sector of hard disk where the data has to be written.

Hardware Support by File System

Block

File Naming ConventionFile are generally named in two parts first one is file name for user and second is file extension used by operating system.

Resume.doc

In DOS based operating systems files are named in 8:3 format, which means the file name could have maximum 8 characters and extension is 3 characters long.

Now in windows users have the freedom of using large file names of maximum 255 characters and extensions could be 4 or more characters long.

File ExtensionsFile extensions are the most important part of any file name since it tells operating system to which program the file is associated.

How to show file extensions in Window XP ?

Open “ Control Panel”Open “ Folder Options”Click on “ View” TABLook for “Hide extensions for known file types” and uncheck this boxClick “Ok” to apply settings

Now you will be able to see extensions for each of your file.

Some Examples of File Extensions txt – Text document (Notepad)jpg – Image File (Windows Picture and Fax Viewer)doc – Microsoft Word 97-2003 Filempg – Media File (Windows Media Player)html – HTML File (Internet Explorer)xlsx – Microsoft Excel 2007-2010 Filepdf – Adobe Acrobat Fileini – Windows System Filedrv – Windows System File for driversvbs – Visual Basic Script File

Other Special File Extensions:

torrent – A torrent link Filegadget – Windows Vista/7 sidebar applicationsflac – Audio files encoded by FLAC codec

Thanks