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`NTFS General Information > NTFS Basics > NTFS Master File Table (MFT)
`
`NTFS Master File Table (MFT)
`
`Each file on an NTFS volume is represented by a record in a special file called the master file table (MFT).
`NTFS reserves the first 16 records of the table for special information. The first record of this table describes
`the master file table itself, followed by a MFT mirror record. If the first MFT record is corrupted, NTFS reads
`the second record to find the MFT mirror file, whose first record is identical to the first record of the MFT. The
`locations of the data segments for both the MFT and MFT mirror file are recorded in the boot sector. A
`duplicate of the boot sector is located at the logical center of the disk.
`
`The third record of the MFT is the log file, used for file recovery. The seventeenth and following records of
`the master file table are for each file and directory (also viewed as a file by NTFS) on the volume.
`
`Figure provides a simplified illustration of the MFT structure:
`
`Figure 5-2 MFT Structure
`
`The master file table allocates a certain amount of space for each file record. The attributes of a file are
`written to the allocated space in the MFT. Small files and directories (typically 1500 bytes or smaller), such
`as the file illustrated in next figure, can entirely be contained within the master file table record.
`
`Figure 5-2 MFT Record for a Small File or Directory:
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`https://web.archive.org/web/20070204043507/http://ntfs.com/ntfs-mft.htm
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`Dropbox Exhibit 1011 - Page 1
`Dropbox, Inc. v. Entangled Media, LLC
`IPR2024-00285 - U.S. Patent No. 8,484,260
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`
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`12/10/23, 11:56 PM
`
`NTFS.com Master File Table.Fix MFT
`
`This design makes file access very fast. Consider, for example, the FAT file system, which uses a file
`allocation table to list the names and addresses of each file. FAT directory entries contain an index into the
`file allocation table. When you want to view a file, FAT first reads the file allocation table and assures that it
`exists. Then FAT retrieves the file by searching the chain of allocation units assigned to the file. With NTFS,
`as soon as you look up the file, it's there for you to use.
`
`Directory records are housed within the master file table just like file records. Instead of data, directories
`contain index information. Small directory records reside entirely within the MFT structure. Large directories
`are organized into B-trees, having records with pointers to external clusters containing directory entries that
`could not be contained within the MFT structure.
`
`
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`https://web.archive.org/web/20070204043507/http://ntfs.com/ntfs-mft.htm
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`Dropbox Exhibit 1011 - Page 2
`Dropbox, Inc. v. Entangled Media, LLC
`IPR2024-00285 - U.S. Patent No. 8,484,260
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