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The NTFS File System

Architecture, Internals, and Implementation of the New Technology File System

The NTFS File System
This book is 100% completeLast updated on 2026-07-30
Steve Publications

Go beyond the NTFS API and learn how the filesystem really works. This book explains NTFS from its on-disk structures to a complete working implementation, giving you the knowledge to understand and build one of the world's most sophisticated filesystems.

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About the Book

This book teaches the NTFS filesystem from first principles through full implementation. You will learn how every component works on disk, why the design choices were made, and how to build a working NTFS parser, reader, writer, allocator, directory manager, journaling subsystem, and metadata handler. Each chapter builds directly on the previous one, culminating in a minimal but functional NTFS implementation. The book is written for experienced software developers, operating system engineers, and computer science students who want deep, production-level understanding of one of the most sophisticated filesystems ever designed.

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StorageOperating System DevelopmentC and C++

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About the Author

Steve Publications

Steve is a technology professional with more than 20 years of experience spanning software development, server infrastructure, cybersecurity, vulnerability research and reverse engineering. His work focuses on understanding complex systems, uncovering security weaknesses and developing practical solutions that make technology more secure, reliable and effective.

Through Steve Publications, he collaborates with experienced researchers, engineers and industry experts to create practical, technically rigorous books on various topics not limited to self-improvement, software development, cybersecurity, cloud computing, DevOps, artificial intelligence and enterprise technologies. His mission is to make complex technical subjects accessible through clear explanations, real-world examples and hands-on exercises that help IT professionals, students and technology enthusiasts build valuable, practical skills.

Steve Publications embraces AI as a supporting tool for translation, proofreading and editorial refinement, not as a substitute for original research, technical expertise, or hands-on experience. Some contributors choose to publish under pseudonyms to protect their privacy or maintain professional boundaries.

Behind every book is a commitment to technical accuracy, practical relevance and continuous improvement. Our publications are written, reviewed and maintained by experienced professionals, with support from a private community of more than 420 engineers and researchers. Rather than prioritizing volume or mass-produced AI-generated content, we focus on delivering reliable, useful resources that readers can apply in real-world environments.

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Our commitment is simple: To deliver books that respect our readers' time, support their professional growth and provide lasting practical value. If a book does not meet your expectations, Leanpub offers a 60-day money-back guarantee.

Contents

Table of Contents

Architecture, Internals, and Implementation of the New Technology File System

Introduction: The Architecture of Persistence

  1. Why NTFS Matters
  2. The Book’s Approach
  3. How to Read This Book

Chapter 1: Volume Layout and the Boot Sector

  1. Sectors, Clusters, and Volume Geometry
  2. The Boot Sector Structure
  3. BIOS Parameter Block Fields
  4. Parsing the Boot Sector (Code)
  5. Volume Identification and Signatures
  6. Walkthrough: Parsing a Real Boot Sector

Chapter 2: The Master File Table

  1. MFT Architecture and Location
  2. File Record Segment Header
  3. Attribute Types and the Type Registry
  4. Resident Attributes
  5. Non-Resident Attributes
  6. Parsing File Records (Code)
  7. Walkthrough: Reading MFT Records

Chapter 3: Core Attributes - Standard Information, Filename, Security

  1. The $STANDARD_INFORMATION Attribute
  2. The $FILE_NAME Attribute and Unicode Filenames
  3. Security Descriptors and DACLs
  4. SID Structure and Parsing
  5. Building the Metadata Handler (Code)

Chapter 4: Data Attributes and Runlists

  1. The $DATA Attribute
  2. Runlist Encoding and Decoding
  3. Parsing Non-Resident Data (Code)
  4. Sparse Files and Zero Runs
  5. Compression on NTFS
  6. Walkthrough: Decoding Runlists and Reading File Data

Chapter 5: Directories and B+ Tree Indexing

  1. The $INDEX_ROOT Attribute
  2. B+ Tree Architecture in NTFS
  3. Index Entries and Collation Rules
  4. The $INDEX_ALLOCATION Attribute
  5. Directory Traversal (Code)
  6. Walkthrough: Listing Directory Contents

Chapter 6: Allocation Structures - Bitmaps, Clusters, and the Allocator

  1. The $BITMAP Attribute
  2. Cluster Allocation Strategies
  3. Free Space Search Algorithms
  4. Bad Cluster Management ($BAD_CLUSTERS)
  5. Building the Allocator (Code)

Chapter 7: Links, Reparse Points, and Extended Attributes

  1. Hard Links and MFT Reference Counting
  2. Symbolic Links and Junction Points
  3. Reparse Points and the Filter Architecture
  4. Alternate Data Streams (ADS)
  5. Object IDs and Extended Attributes
  6. Parsing Reparse Points (Code)

Chapter 8: Transaction Logging and Recovery

  1. The NTFS Log File ($LogFile)
  2. Write-Ahead Logging Protocol
  3. Log Record Formats
  4. Crash Recovery Algorithm
  5. Building the Journaling Subsystem (Code)

Chapter 9: Special Files and System Metadata

  1. The Metadata File Registry
  2. $Volume and Volume Flags
  3. $AttrDef - Attribute Definitions
  4. $Quota - Disk Quotas
  5. $UpCase and $Extend Tables

Chapter 10: The USN Journal and Change Tracking

  1. USN Journal Architecture
  2. USN Record Formats
  3. Querying the Journal
  4. Forensic and Monitoring Applications

Chapter 11: Encryption, Quotas, and Advanced Features

  1. Encrypting File System (EFS) Architecture
  2. FVEK and DEK Encryption Scheme
  3. Disk Quota Enforcement
  4. Volume Caching Considerations
  5. Consistency Checking (chkdsk Logic)

Chapter 12: Version Evolution and Compatibility

  1. NTFS 1.0 - Windows NT 3.1
  2. NTFS 1.1 and 1.2 - Incremental Improvements
  3. NTFS 3.0 - The Major Leap
  4. NTFS 3.1 and Later Evolutions
  5. Cross-Version Compatibility Matrix
  6. Interoperability with Other Platforms

Conclusion: The Complete Implementation

  1. What We Built
  2. What a Production Implementation Needs
  3. Where to Go Next

References

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