Mount CHD (Compressed Hunks of Data) CD/DVD images as virtual read-only drives on Windows. Supports 31 console types and 8 filesystem formats across consoles and PC optical media.

• Mount CHD files as virtual drives using Dokan or WinFsp
• 31 console types — ISO 9660, UDF, XDVDFS (Xbox), OperaFS (3DO), CD-i Green Book, HFS/HFS+ (Pippin), and more
• Virtual CUE/BIN/ISO/WAV export — 5 disc image export modes for emulators and burning tools
• SingleFile ISO passthrough — single image.iso file for emulators that expect raw ISO (xemu, RPCS3)
• Read-only — never modifies your CHD files
• Automatic filesystem detection by track header — no manual setup needed for most discs
• Command-line interface for scripting and frontend integration
• WPF dark theme UI with console type dropdown, real-time log output, settings dialog
• Settings with DPAPI encryption — persisted across sessions
• Update checker — polls GitHub releases for new versions
• Serilog structured logging to file and debug output
• Single-file self-contained publish — distribute as one .exe
• x64 and ARM64 support

• Windows 10 or later (x64 or ARM64)
• .NET 10.0 Desktop Runtime (or self-contained build ships its own)
• Dokan Use latest version — install Dokany
  or
• WinFsp Use latest version — download WinFsp

Only one driver is needed. The Dokan executable uses Dokan; the WinFsp executable uses WinFsp. Both ship side-by-side.

Grab the latest self-contained executable from Releases:

• CHDMounter.exe — Dokan-based
• CHDMounter_WinFsp.exe — WinFsp-based

No installation required. Just download and run.

CHDMounter.exe

Opens the main window. Click Browse to select a CHD file, pick a filesystem type from the dropdown, and click Mount. The drive appears in Explorer.

CHDMounter.exe [/l] [/a] [/s:<index>] <chd_file> [mount_point]
CHDMounter_WinFsp.exe [/l] [/a] [/s:<index>] <chd_file> [mount_point]

Notes:

• Arguments can be in any order
• Flags are prefixed with /
• A bare numeric argument (not prefixed with /) is accepted as a console index shorthand
• If only <chd_file> is provided without flags, a dialog appears asking you to choose

You can specify the console type using either a numeric index or a string alias (case-insensitive).

Examples:

# Mount a PS2 game as drive M:
CHDMounter.exe /s:9 game.chd M:

# Mount an Xbox 360 game (auto-select drive letter)
CHDMounter.exe 17 game.chd

# Mount a Dreamcast game and launch Explorer
CHDMounter.exe /l /s:4 game.chd

# Mount as virtual CUE/BIN
CHDMounter.exe /s:20 disc.chd

# Mount with generic ISO 9660 parser
CHDMounter_WinFsp.exe /s:19 data.chd N:

# Using the WinFsp variant with console name alias
CHDMounter_WinFsp.exe game.chd ps3

If no console type is specified, a dialog appears asking you to choose.

• .NET 10.0 SDK
• Windows 10+ (x64 or ARM64)

CHD (Compressed Hunks of Data) is MAME's lossless compression format for CD/DVD/HDD images. CHDMounter uses CHDSharp to read all five CHD versions (V1-V5) and all compression codecs:

• General: zlib (deflate), LZMA, FLAC (headerless, 16-bit stereo), dynamic Huffman, Zstd
• CD-sector: CDZL (zlib), CDLZ (LZMA), CDFL (FLAC), CDZS (Zstd) — with ECC regeneration
• AV: AVHuff — audio+video Huffman for laserdisc/arcade captures

The SectorReader maps logical block addresses (LBAs) to byte offsets within CHD hunks. It:

1. Parses track metadata (CHT2/CHTR/CHGD tags) for multi-track CD images
2. Maps LBA to CHD frame number using track offsets (handles GD-ROM 45000-LBA shift)
3. Reads and caches the compressed hunk via ReadHunk()
4. Detects sector mode (Mode 1 = 16-byte header, Mode 2 = 24-byte header) by scanning for the CD sync pattern 00 FF×10 00
5. Strips headers to deliver 2048 bytes of user data per sector

CHDMounter uses the VideoGameFileSystemParser library (v1.0.0) to parse various console file systems from raw 2048-byte sectors and reconstruct directory trees.

Supported file systems include ISO 9660 (with Joliet/Rock Ridge), XDVDFS (Xbox), OperaFS (3DO), CD-i Green Book, UDF, and HFS/HFS+.

The ChdContainer bridges the parsed FsNode tree to the Dokan/WinFsp VFS layer:

• Dokan: ChdFs implements IDokanOperations — CreateFile resolves paths, ReadFile maps file offsets to sector reads, FindFiles lists directories, GetVolumeInformation reports "CHDFS" read-only volume.
• WinFsp: ChdFs extends FileSystemBase — Open resolves paths and returns FileEntry as both file node and descriptor, Read copies sector data into native memory via Marshal.Copy, ReadDirectoryEntry enumerates children with . and ...

For CUE/BIN/ISO/WAV modes, the container generates virtual entries dynamically:

• The .cue file contains standard FILE, TRACK, and INDEX descriptors built from CHD track metadata.
• The .bin/.iso file maps reads to raw sector data (2352 or 2048 bytes per sector).
• .wav files are generated per audio track with standard WAV headers.

For SingleFile mode, the container serves the entire decompressed CHD image as a single image.iso file via CHDFile.Read().

Both variants share the same core functionality and UI. Choose based on your driver preference.

WPF desktop application for batch testing and benchmarking CHD disc image parsing. Scans folders of .chd files, parses each one with a selected console file system parser, and generates summary reports with PDF export.

• Select a folder of CHD files and a target console type
• Batch-parse every .chd file in the folder
• Report success/failure, file count, directory count, volume size, and timing per file
• View aggregated summary statistics (fastest, slowest, average, total throughput)
• Export results to PDF with QuestPDF

1. Launch CHDMounter_Tester.exe
2. Select a folder containing .chd files
3. Choose a console type from the dropdown
4. Click Run Tests to begin batch parsing
5. Click Export PDF to save results

• CHDSharp — https://github.com/drpetersonfernandes/CHDSharp
• VideoGameFileSystemParser — https://github.com/drpetersonfernandes/VideoGameFileSystemParser
• MAME — https://github.com/mamedev/mame

This project is licensed under the GPLv3 License – see the LICENSE file for details.