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FAT (File
Allocation Table) File System
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Initially designed
for computers with small hard disks (less than 500mb)
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Developed for use
with MS-DOS
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Compatible with
Windows NT, 2000, 95 and 98
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Hard disks set up
in a series of allocation units (clusters) to form a partition
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Allocation unit may
consist of 2, 4, or 8 sectors on a disk
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Files are created
from one or more allocation units
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Operating system
keeps track of used and unused of allocation units in the file allocation
table at the beginning of each
FAT16
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Original version
designed for a 16 bit system
Advantages
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Low operating
system overhead
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Can support
partitions up to 4 GB
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Can support file
sizes up to 2 GB
Disadvantages
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Becomes corrupted
over time as files are spread amongst disjointed allocation units and
pointers become lost
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Very limited file
and directory security and auditing options
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File names are
limited to 11 characters; 8 for the main name and 3 for the extension
FAT32
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Introduced in
Windows 95, version2
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Designed for a 32
bit system
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Enables smaller
allocation units than FAT16
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Can support
partitions up to 32 GB
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Can support file
sizes up to 4 GB
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Includes support
for long file names (256 characters)
NTFS (NT File System)
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The native Windows
NT and Windows 200 file system
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Equipped with
security features designed to meet U.S. government security specifications
for data protection, system auditing and system access.
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NTFS 4
has the following features:
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Long filenames
– up to 256 characters
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File compression
– reduces file size by methods such as removing unused space within a
file or compression algorithms. Can be compressed around 40%
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Large file capacity
– For example SQL database files which could be 20 GB or more
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File activity tracking
– Keeps a log of file system activity
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Volume extension
– The existing volume can be extended to include an additional hard disk
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NTFS 5 has these
additional features
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Ability to
encrypt files
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No system
reboot after creating an extended or spanned volume
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Indexing for
fast access
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Ability to
retain shortcuts and other file information when files and folders are
placed on other volumes
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Ability to
establish disk quotas
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