what is difference between fat & ntfs
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Answer Posted / pothanprasad
FAT OVERVIEW
FAT is by far the most simplistic of the file systems
supported by Windows NT. The FAT file system is
characterized by the file allocation table (FAT), which is
really a table that resides at the very "top" of the volume.
To protect the volume, two copies of the FAT are kept in
case one becomes damaged. In addition, the FAT tables and
the root directory must be stored in a fixed location so
that the system's boot files can be correctly located.
A disk formatted with FAT is allocated in clusters, whose
size are determined by the size of the volume. When a file
is created, an entry is created in the directory and the
first cluster number containing data is established. This
entry in the FAT table either indicates that this is the
last cluster of the file, or points to the next cluster.
Updating the FAT table is very important as well as time
consuming. If the FAT table is not regularly updated, it can
lead to data loss. It is time consuming because the disk
read heads must be repositioned to the drive's logical track
zero each time the FAT table is updated.
There is no organization to the FAT directory structure, and
files are given the first open location on the drive. In
addition, FAT supports only read-only, hidden, system, and
archive file attributes.
NTFS OVERVIEW
From a user's point of view, NTFS continues to organize
files into directories, which, like HPFS, are sorted.
However, unlike FAT or HPFS, there are no "special" objects
on the disk and there is no dependence on the underlying
hardware, such as 512 byte sectors. In addition, there are
no special locations on the disk, such as FAT tables or HPFS
Super Blocks.
The goals of NTFS are to provide:
* Reliability, which is especially desirable for high
end systems and file servers
* A platform for added functionality
* Support POSIX requirements
* Removal of the limitations of the FAT and HPFS file
systems
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