NFI is described as 'NTFS File Sector Information Utility. NFI is a command line tool that can be used to (1) display information about all entries in the Master File Table ($MFT), (2) display information about what NTFS file contains a particular sector within a "physical drive" (3)' and is an app in the system & hardware category. There are 2 alternatives to NFI for Windows, Linux and Mac. The best NFI alternative is DMDE, which is free.
DM Disk Editor and Data Recovery (DMDE) is a disk editor which can help you to understand NTFS. Its capable to view your hard disk sector wise, on MFT level, to disect mft attributes and to edit bytes on your hard disk.
This is also a disk editor. It comes with a very clean and usable UI and offers comprehensive information about NTFS.
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