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Media Descriptor File
Media Descriptor File
Media Descriptor File
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Media Descriptor File
Filename extension
.mdf
Type of formatDisc image
Media Descriptor
Filename extension
.mds
Magic numberMEDIA DESCRIPTOR
Type of formatSidecar file

Media Descriptor File (MDF) is a proprietary disc image file format developed for Alcohol 120%, an optical disc authoring program. Daemon Tools, CDemu, MagicISO, PowerDVD, and WinCDEmu can also read the MDF format.[1][2] A disc image is a computer file replica of the computer files and file system of an optical disc.

Unlike an ISO image[citation needed], a Media Descriptor File can contain multiple layers (as used in dual-layer recording) and multiple optical disc tracks. Like the IMG file format, a Media Descriptor File is a "raw" image of an optical disc. The word raw implies that the copy is precise, bit-for-bit, including (where appropriate) file-system metadata.

A Media Descriptor File may be accompanied by a Media Descriptor Sidecar file. This optional binary file (with file extension .mds) contains metadata about an imaged optical disc, including a delineation of where disc layers begin and end ("layer breaks"), and which portions of the MDF belong in which disc layer. The MDS file also stores the location and value of the layer breach bit, a CD/DVD copy protection mechanism. The MDS file is comparable to the CloneCD Control File and cue sheet (.cue) file formats. However, their capabilities are not identical; also the cue sheet is a text file format.

Alcohol 120%'s MDF/MDS format is one of the few formats besides Nero's NRG, BIN/CUE and CloneCD's CCD/IMG/SUB disc image formats to support Mixed Mode CDs which contain audio CD tracks as well as data tracks.

See also

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References

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Media Descriptor File

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from Grokipedia
A Media Descriptor File (MDF) is a disc image file format developed by Alcohol Soft for their Alcohol 120% software, designed to create exact backups of CD and DVD content by storing the raw sector data from optical discs. Often paired with a companion Media Descriptor Image (MDS) file, which contains essential metadata such as track layouts, session information, and layer breaks for multi-layer discs, the MDF/MDS combination enables accurate emulation and burning of disc images, including those with copy protections like . Introduced in the early 2000s alongside , this format gained popularity for its ability to handle complex disc structures that standard ISO images could not, such as sub-channel data and advanced sector scanning for error-prone media. The software's Image Making Wizard defaults to the MDS format for output, allowing users to specify options like reading sub-channel data or skipping errors during creation, with recommended low-speed (1x) Data Position Measurement for precision. Beyond Alcohol 120%, MDF/MDS files are supported by various third-party tools including , IsoBuster, PowerISO, and , facilitating mounting as virtual drives or conversion to other formats like ISO for broader compatibility. While primarily used for archival and emulation purposes, the format's nature limits native support in some open-source applications, though utilities exist for extraction and manipulation.

Overview

Definition and Purpose

The Media Descriptor File (MDS) is a format developed by Alcohol Soft for use with their Alcohol 120% disc imaging software, storing descriptive metadata for and DVD disc images in a binary structure that begins with the ASCII identifier "MEDIA DESCRIPTOR." Primarily associated with the accompanying .MDF binary image file, which holds the raw sector data, the MDS provides essential details on the disc's organization to enable complete image functionality. The primary purpose of the MDS is to preserve critical layout information from the original optical media, such as track positions, session boundaries, and layer breaks for dual-layer discs, allowing accurate emulation, virtual mounting, or burning of the image without requiring the physical disc. This metadata ensures that software can replicate the disc's behavior, including multi-session structures and cues, which are vital for faithful reproduction in archiving or playback scenarios. Developed in the early 2000s as part of Alcohol 120%, common use cases include generating descriptors for single-layer CDs to support audio ripping and track extraction, or for dual-layer DVDs to handle video backups with precise layer transition points.

Relation to MDF Files

The Media Descriptor File (MDS) complements the Media Descriptor File (MDF) by forming a paired disc image format, where the MDF acts as the primary binary container for the raw sector data extracted from an optical disc, encompassing tracks, sectors, and optional subchannel information. In contrast, the MDS supplies the essential index and structural metadata, such as session details and track layouts, to enable proper interpretation of the MDF's contents. The pairing mechanism relies on the MDS referencing the MDF explicitly by filename, stored in a dedicated block within the MDS structure, which points to the binary data file without duplicating any sector content. This reference allows the MDS to define mappings, such as sector offsets to specific tracks and sessions, facilitating targeted access to data blocks in the MDF for tasks like emulation or burning. This dual-file approach provides key advantages, including the maintenance of a compact, editable metadata component separate from the voluminous raw image, which supports modifications to disc properties like layer breaks in dual-layer DVDs without altering the underlying sector data. Such separation enhances flexibility for tools handling protected or multi-session media, ensuring accurate replication of physical disc characteristics and copy protections. Format-wise, the MDS is a structured , typically measuring under 1 KB due to its metadata-only role, while the MDF is a large-scale binary format that scales with disc size—for instance, around 4.7 GB for a standard single-layer DVD image.

History

Development by Alcohol Soft

The Media Descriptor File (MDF) format was created by Alcohol Soft, a software company based in , , as part of their suite of optical disc emulation tools designed to facilitate CD and DVD backup and virtual mounting. The company specialized in developing software for disc imaging and burning, aiming to provide users with reliable solutions for handling physical media in digital form. The format was introduced alongside version 1.0 in October 2002, specifically to overcome shortcomings in standard ISO formats, which often failed to preserve essential structural information from multi-session CDs or multi-layer DVDs during imaging. This allowed for more faithful reproductions of disc layouts, including session breaks and track configurations that ISO images could not adequately capture. Development was driven by the need to enable precise duplication of complex or protected media, such as copy-protected CDs and DVDs, where conventional formats like ISO discarded critical data such as subchannel information or protection schemes, leading to incomplete or non-functional backups. Initial versions of the MDF/MDS implementation emphasized support for CD media, enabling emulation of multi-session discs common in the early software distribution. By 2003, enhancements were added to accommodate DVD capabilities, particularly handling layer breaks in dual-layer DVDs to ensure seamless playback and burning without . This evolution laid the groundwork for broader use in disc emulation, with subsequent adoption extending its utility beyond Alcohol Soft's ecosystem.

Adoption and Evolution

Following its initial release, the Media Descriptor Small (MDS) format saw rapid third-party adoption, particularly in virtual drive emulation software. By 2004, DAEMON Tools version 3.47 integrated support for MDS files, enabling users to mount them as virtual optical drives for applications in gaming and software testing, which broadened the format's utility beyond Alcohol 120%'s native ecosystem. This integration facilitated easier handling of disc images with embedded metadata, such as layer break information for dual-layer DVDs, without requiring the proprietary authoring tool. The format's evolution remained conservative, with minimal structural changes but incremental enhancements to accommodate emerging media standards. In 2009, Alcohol 120% version 2.0 introduced support for Blu-ray discs, allowing MDS files to describe single- and dual-layer Blu-ray images while preserving compatibility with older CD and DVD formats. By 2008, freeware tools like added read and write compatibility for MDS files, enabling users to create or burn such images without proprietary software, which further democratized access and sustained the format's relevance in disc imaging workflows. Despite these updates, the core MDS specification—focused on metadata like track layouts and session details—stayed largely unchanged, prioritizing over major overhauls. As of 2023, the latest version of Alcohol 120% (2.1.1.2201) continues to support the format without major revisions. MDS prominence peaked in the mid-2000s alongside the height of optical media usage, when DVD sales reached approximately $16 billion annually in the United States. By the , however, the format was overshadowed by more universal standards like ISO, as streaming services dominated and reduced demand for physical disc emulation; U.S. DVD and Blu-ray sales had plummeted over 93% from their 2005 peak, dipping below $1 billion in 2024. Nonetheless, MDS persists in niche archival applications, where its ability to capture detailed disc metadata aids in preserving legacy optical media against degradation. The format also gained notoriety in warez communities during the mid-2000s for its capacity to replicate copy-protected discs, as MDS files could store subchannel data and Defect Position Management (DPM) information essential for emulating protections like and . This association drew legal scrutiny from copyright holders concerned about unauthorized replication, though it prompted no significant alterations to the MDS structure, which remained focused on accurate media description rather than anti-piracy measures.

Technical Specifications

File Structure

The Media Descriptor File (MDS) is a binary file format used alongside the MDF disc image file to store structural metadata about optical discs, such as CD-ROMs and DVDs, enabling accurate emulation and parsing by software like Alcohol 120%. Developed by Alcohol Soft, the MDS format organizes information in a compact, hierarchical binary structure rather than plain text, facilitating efficient reading of disc layout details including sessions, tracks, and sector offsets. This binary design supports features like multi-session discs and subchannel data, distinguishing it from text-based formats like CUE sheets. The file opens with an 88-byte (0x58) header that provides core disc descriptors. This header includes a 16-byte ASCII identifier "MEDIA DESCRIPTOR" at offset 0x00, followed by unknown bytes (e.g., 0x01 or 0x03) at 0x10 (2 bytes), the (a 2-byte value, e.g., 0x00 for , 0x01 for , 0x02 for , or 0x10 for DVD-ROM) at 0x12, the number of sessions (typically 1, as a 2-byte at 0x14), a 4-byte offset to read errors (usually 0x00) at 0x54, and a 4-byte offset to the first session block (usually 0x58) at 0x50. Additional fields in the header cover reserved bytes for future extensions. Layer breaks for dual-layer DVDs are implied through media type and session data. Following the header are one or more session blocks, each 24 bytes (0x18) in length, describing the organization of sessions on the disc. A session block starts with the session's start sector (4 bytes at 0x00, often 0xFFFFFF6A or -150 for lead-in areas), end sector (4 bytes at 0x04), first track number (2 bytes at 0x0C, e.g., 0x01 to 0x63), and a 4-byte offset to the first track data block (typically 0x70) at 0x14. These blocks allow for multi-session support, common in CD-ROMs with added across multiple recording sessions. Each session references track data blocks, which are 80 bytes (0x50) each and detail individual tracks within the session. A track data block includes the track mode (1 byte at 0x00, e.g., 0xA9 for audio/2352-byte raw sectors or 0xAA for Mode 1/2048-byte sectors), number of subchannels (1 byte at 0x01, 0=none or 8 for +96 bytes subchannel data), track number or point index (1 byte at 0x04, ranging from 0x01 to 0x63 for standard tracks or 0xA0+ for lead-in/lead-out), track start sector (4 bytes at 0x24, LBA e.g., 0x00000000), and track start offset in MDF (8 bytes at 0x28). A 4-byte offset to the associated index block follows at an appropriate position within the block. Index blocks (8 bytes) specify sector counts for indices 0 and 1 (4 bytes each), aiding precise navigation. Filename blocks (16 bytes or 0x10) point to null-terminated strings like "*.mdf" for the paired image file (filename strings 6 bytes). Lead-in and lead-out sectors are handled via special point indices (e.g., 0xA0 for lead-in). Subchannel data, if present, adds 96 bytes per sector (MSB first for P-W channels). A read errors section, if used, records LBAs of read errors at the offset specified in the header. A simplified structural outline of an MDS file for a single-session DVD-ROM might appear as follows in conceptual terms (actual content is binary hex data):
  • Header (0x00-0x57): ID="MEDIA DESCRIPTOR"; Unknown=0x01; MediaType=0x10 (DVD-ROM); Sessions=0x01; OffsetToErrors=0x00; OffsetToSession=0x58
  • Session Block 1 (0x58-0x6F): StartSector=0xFFFFFF6A; EndSector=0xXXXXXXX (disc total); FirstTrack=0x01; OffsetToTrack=0x70
  • Track Data Block 1 (0x70-0xBF): Mode=0xAA; Subchannels=0x00; Point=0x01; ... StartSector=0x00000000 (at 0x24); StartOffset=0x00000000 (at 0x28); OffsetToIndex=...; Length=0xXXXXXXX; FilenameOffset=... (*.mdf)
  • Index Block: Index0Sectors=0x00000000; Index1Sectors=0xXXXXXXX
  • Footer Elements: Optional additional tracks, filename strings, or read errors at end.
This organization ensures the MDS file remains small (often under 10 KB) while providing a complete blueprint for reconstructing the disc's geometry, including references to the MDF file for actual sector data.

Key Metadata Elements

The Media Descriptor File (MDS) encapsulates essential metadata that delineates the layout and content types of the associated disc image, facilitating precise emulation of optical media such as CDs and DVDs. This binary-structured file pairs with the MDF data file to reconstruct the original disc's behavior, including sector-level details and session boundaries. Core descriptors at the file's header provide foundational information about the disc's nature. The MEDIATYPE field, a 2-byte identifier at offset 0x12, specifies the disc category; for instance, 00h denotes (data), 01h indicates , 02h , and 10h represents DVD-ROM. Sector modes are defined separately in track details. Track details form a series of data blocks within the MDS, each outlining individual sessions or tracks for accurate sequential playback. The MODE field, a 1-byte value at offset 0x00 in track blocks, defines the track's format; examples include AAh for Mode 1 (2048-byte sectors) and A9h for audio (2352-byte raw sectors). STARTSECTOR, a 4-byte absolute position at 0x24, marks the track's beginning in (LBA). ENDSIZE, derived from session end and aggregated tracks, specifies the track's extent in sectors, allowing computation of offsets within the MDF. Session information ensures proper timing and spacing across tracks. The total disc capacity emerges from aggregating track lengths and sectors, yielding the full addressable space in sectors. The format supports subchannel data for advanced emulation, with a field indicating addition of 96 bytes per sector if present. A read errors section may store locations of sectors that failed reading during image creation, aiding in error-prone media handling.

Software Support

Primary Applications

Alcohol 120%, developed by Alcohol Soft, serves as the flagship application for creating and managing Media Descriptor (MDS) files, which are paired with (MDF) images during disc ripping processes. The software's Image Making Wizard generates MDS/MDF pairs from source CD/DVD/Blu-ray discs, supporting various track modes such as Mode 1, Mode 2 XA, and audio tracks to accurately replicate disc structures, including sub-channel data for protected media. Users can edit metadata elements like track types and positions within the image properties, enabling precise customization before mounting or burning. The latest version, 2.1.1.2201 released in 2023, enhanced device support and maintained full Blu-ray compatibility, including single- and double-layer formats introduced in earlier versions like 1.9.7. DAEMON Tools, a virtual drive emulator originally released in the early , natively supports MDS files for mounting complex disc images, such as multi-session CDs and protected DVDs. The Pro version, available since 2005, extends this to include creation capabilities, allowing users to grab discs directly into MDS/MDF formats alongside its proprietary MDX, with features for handling audio CDs and data sessions. It emulates up to 32 virtual drives (DT, , IDE, and HDD) to access these images seamlessly, preserving elements like layer breaks and copy protections without additional configuration. ImgBurn, a free open-source burning utility, provides read support for MDS files to ensure accurate disc replication, particularly for dual-layer DVDs where it preserves layer breaks as specified in the descriptor. During the write process, it interprets MDS metadata to maintain original disc layout, track modes, and session information, making it suitable for verifying and burning MDF images without altering the source structure. ImgBurn can generate MDS files via its Tools menu, particularly for DVDs, and integrates them with ISO outputs when layer break or advanced session data is detected.

Compatibility and Conversion Tools

Several open-source tools facilitate working with MDS/MDF files outside of , particularly for parsing metadata and mounting images. CDEmu, a Linux-based CD/DVD emulation suite, supports loading and emulating MDS/MDF formats, allowing users to access disc contents without full commercial emulation environments. This enables virtual drive mounting for playback or extraction on systems. Conversion utilities provide options for migrating MDS/MDF files to more universal formats like ISO or CUE/BIN. PowerISO can open MDS/MDF images and convert them to ISO, supporting extraction and burning workflows across Windows platforms. Similarly, handles MDS/MDF import and export to ISO, facilitating compatibility with standard disc imaging tools. These conversions preserve core data tracks but may not retain all proprietary MDS metadata, such as custom session descriptors. In virtual machine environments, MDS/MDF compatibility is achieved indirectly by mounting the images via external tools and mapping the resulting virtual drives. For instance, software like Alcohol 120% or can mount the image on the host system, after which the virtual CD/DVD can be attached to guests in or for emulated access. File extension handling for MDS/MDF varies by operating system. On Windows, these files default to associations with Alcohol 120%, enabling direct opening and management upon installation. In contrast, requires specialized tools like CDEmu for support, as native utilities such as fuseiso lack compatibility with the proprietary MDS format due to its non-public specification.

Usage and Applications

Creating Disc Images

Creating a Media Descriptor File (MDS) paired with its Media Data File (MDF) typically involves physical optical media using dedicated software like Alcohol 120%. The process begins by inserting the source disc—such as a or DVD—into a compatible optical drive. Within the software's Image Making Wizard, the user selects the drive and initiates the scan, which reads the disc's sectors to generate the MDF file containing the content and the MDS file encoding the structural metadata, including session details and track layouts. For instance, on a multi-track , the wizard detects and records each track's start and end sectors in the MDS, accurately capturing configurations like 16 distinct tracks on enhanced or mixed-mode discs. This workflow ensures the image preserves the original disc's layout for later emulation or burning. Handling complexities during creation requires attention to disc type-specific features. For dual-layer DVDs, the ripping software automatically detects and embeds the layer break position— the point where the transitions between layers—directly into the MDS file, enabling accurate reproduction of the disc's physical structure without manual intervention. Audio CDs require enabling sub-channel reading to capture track boundaries and International Standard Recording Code (ISRC) for each track in the MDS, ensuring comprehensive preservation of audio-specific metadata. The process supports multi-session CDs by recording multiple lead-in/lead-out areas and session starts in the MDS, allowing of discs with appended or mixed content across sessions. Overburned media, where exceeds standard capacity, is similarly accommodated by extending the recorded track lengths beyond nominal limits in the MDS metadata. Best practices emphasize post-creation verification to ensure fidelity. After generating the files, users should mount the image in the originating software and compare playback or data access against the physical disc to confirm structural integrity. While the MDS itself lacks built-in checksums, computing a hash (such as MD5) of the MDF file provides a verifiable baseline for detecting corruption during storage or transfer; mismatches indicate read errors during ripping. For protected media, enabling lower read speeds (e.g., 8x) in the wizard minimizes sector timing inaccuracies, particularly beneficial for copy-protected titles. Hardware prerequisites focus on reliable optical drives for accurate sector scanning. The format and supporting software are compatible with bus-mastering ATAPI (IDE) and interfaces, which provide precise control over read operations essential for capturing subtle disc features like subchannel data. Modern USB external drives function adequately for standard rips but can introduce variations in sector response timing within the MDS, potentially affecting emulation of time-sensitive protections; for high-fidelity preservation, or legacy IDE drives remain preferable. At least 32 MB of RAM and 10 GB of free disk space are recommended to handle the scanning and file generation without interruption.

Mounting and Emulation

Mounting an MDS/MDF image pair involves loading the files into compatible emulation software, such as Alcohol 120%, which interprets the MDS descriptor to create a virtual optical drive that mimics the physical media's and . In Alcohol 120%, users can double-click the MDS file to automatically mount it to the first available virtual drive, or select the image via the "Mount Image" option in the Device menu, assigning it a drive letter like E: in Windows for seamless access as if it were inserted . This process supports up to 31 concurrent virtual drives, enabling multiple images to be mounted simultaneously for efficient handling. Emulation of MDS/MDF files offers key advantages by eliminating the need for physical hardware during tasks like software installation or , allowing direct access to the image contents without inserting discs. The format's preservation of cues, such as RMPS, bad sectors, sub-channel data, and LaserLock mechanisms detailed in the MDS, ensures that emulated drives accurately replicate protected media behavior, which is essential for running legacy applications that rely on these features. This fidelity helps maintain compatibility with original disc-based software while protecting against physical media degradation. In advanced scenarios, MDS/MDF emulation facilitates archiving by supporting batch mounting of images for bulk data extraction, making it suitable for institutions like libraries or businesses managing large collections of optical media backups. For digital forensics, the format's retention of sector-level details and emulation of exact disc structures enables precise analysis of media without altering the original image integrity. Performance during emulation varies based on the host system's CPU capabilities, with adjustable priority settings (high, normal, or low) in tools like Alcohol 120% influencing responsiveness. For dual-layer discs, the MDS file's layer break information allows virtual drives to handle transitions seamlessly, avoiding the mechanical seeking delays inherent in physical playback and ensuring smooth video or data access.

Limitations and Alternatives

Known Issues

The (MDS) format has compatibility limitations with certain disc types. While Alcohol 120% added support for Blu-ray formats (single- and double-sided) in version 1.9.5 in 2007, the format exhibits obsolescence for 4K UHD Blu-ray discs. As of version 2.1.1 in 2023, it does not adequately accommodate UHD-specific elements, such as larger capacities and advanced AACS 2.0 encryption, often resulting in incomplete imaging or emulation failures. Improper opposite track path (OTP) information in MDS files for DVD9 discs can cause crashes in premastering software when mounted via tools like Daemon Tools. The binary-encoded structure of MDS files stores disc metadata like sector starts and session blocks in a compact proprietary format.

Conversion Methods and Alternatives

Converting Media Descriptor Files (MDS) paired with Mirror Disc Files (MDF) to more widely supported formats is often necessary for compatibility with modern software and hardware that do not natively handle the proprietary Alcohol 120% format. One common method involves mounting the MDS/MDF image using DAEMON Tools, then using ImgBurn in Read mode to create an ISO output from the virtual drive. This works for single-layer data discs but may fail or require adjustments for dual-layer files exceeding ISO 9660 limits (approximately 4 GB per layer). However, this process discards audio subcodes and mixed-mode track information, as the ISO 9660 standard primarily supports data sessions and does not preserve CD-DA audio tracks. For preserving full fidelity, including multi-track audio and subchannel data, conversion to BIN/CUE format is recommended, though specific tools like CDRDAO may be used after mounting to capture raw sectors. Dual-layer DVDs present additional challenges during conversion to ISO, as the format does not natively support seamless layer transitions; the resulting ISO may require manual splitting into two single-layer files or direct burning without conversion using tools like . In such cases, layer break data must be handled carefully to avoid . Alternative formats offer varying degrees of compatibility and openness compared to MDS/MDF. The format serves as a simple, for single-layer data discs, widely supported across operating systems without needing specialized software. For multi-track audio CDs or mixed-mode discs, the CUE/BIN format provides better preservation of track boundaries and subcodes, functioning as a raw sector dump with a descriptor sheet. As a direct competitor to MDS/MDF, the NRG format from embeds similar descriptor information within a single file, supporting audio, video, and multi-session discs while offering compression options, though it remains proprietary. For long-term archival purposes, open formats like are preferred due to their standardization and broad interoperability, minimizing dependency on legacy tools. MDS/MDF files should be retained only for workflows involving Alcohol 120% or compatible emulators, as conversion mitigates obsolescence risks while prioritizing accessibility.

References

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  32. http://support.alcohol-soft.com/documentation/english/imw.htm
  33. http://wiki.redump.org/index.php?title=MDF/MDS_Dumping_Guide
  34. https://support.alcohol-soft.com/en/knowledgebase.php?postid=15035
  35. https://forum.redump.org/topic/12357/cdromimage-file-format-specifications/
  36. https://www.tecmint.com/generate-verify-check-files-md5-checksum-linux/
  37. https://support.alcohol-soft.com/viewchangelog.php
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  39. https://forum.imgburn.com/topic/19367-newbie-convert-mdfmds-to-iso/
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  41. https://pcai.nero.com/blog/what-is-an-nrg-file-and-how-to-play-it
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