because NTFS file system has more benefits than other.. for example you can do some security permissions just on NTFS volumes and files system..
FAT32 can be used by more operating systems then NTFS. In order to use NTFS the computer must be formatted with the NTFS file system. NTFS systems are able to read both NTFS and FAT32. FAT32 systems cannot read NTFS.
NTFS
NTFS provides greater security and supports more storage capacity than the FAT32
NTFS doesn't have a "bit version." No 16-bit version of Windows ever used NTFS, but there is 16-bit software to access NTFS partitions.
A Translational Bridge is used to connect networks that use different protocols.
NTFS
While the NT File System (NTFS) is better than the FAT16 system, it does have some disadvantages. NTFS has a high space overhead that cannot be used to store data.
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The purpose of a router is to connect dissimilar networks.
NTFS has many more attributes available, over 32,000 possible.
NTFS prevents changes from unauthorized users and prevents them from reading data from a computer. Where as FAT32 does not
NTFS (New Technology File System) FAT (File Allocation Table)