Disk Fragmentation

• Refers to the condition of a disk in which files are divided into pieces scattered around the disk.

• Occurs naturally when frequently modifying, creating or deleting files.

• Results in slow data access speed

Problems

• Increases system boot-up time• Increases response time of applications or

programs• Increases time during installation of software• Worsens delay of system response time or

user input

FAT (File Allocation Table)

• A table that the operating system uses to locate files on a disk. Due to fragmentation, a file may be divided into many sections that are scattered around the disk. The FAT keeps track of all these pieces.

• Versions of the FAT format – FAT12– FAT16– FAT32

NTFS

• NTFS is the standard file system of Windows NT, including Windows 2000, Windows XP, and all their successors to date.

• NTFS supersedes the FAT file system as the preferred file system for Microsoft’s Windows operating systems, NTFS has several improvements over FAT.

New Technology File System (NTFS)

•High-reliability•Security and Access Control•Braking Size Barriers•Storage Efficiency•Long File Names•Networking

Advantages of NTFS over FAT

• The capability to recover from some disk-related errors automatically which FAT32 doesn't have.

• Improved support for larger hard disks.• Better security because you can use

permissions and encryption to restrict access to specific files to approved user.

• Faster access speed. NTFS minimizes the number of disk accesses required to find a file.

Conclusion

• Disk fragmentation would reduce performance and reliability of our computer over time. Disk defragmentation should be performed regularly (weekly).

• NTFS has more advanced features and is in overall better than the FAT file system.

THE ENDTHANK YOU

PresentedBy

Sam Ka Wai

References:• http://www.webopedia.com/TERM/F/fragmentation.html• http://files.diskeeper.com/pdf/The_effects_of_fragmentation_on_reliabilit

y.pdf