NT's native file systempast, present, and future
When Microsoft first released Windows NT, it came with support for three file systems: FAT, HPFS, and NTFS. Microsoft originally designed FAT for DOS, IBM introduced HPFS for OS/2, and Microsoft created NTFS for NT. NTFS is NT's native format, and NT supports the FAT and HPFS formats to provide migration paths from the other operating systems (although Microsoft didn't include support for HPFS in NT 4.0).
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