Most standard PC drives will intentionally misread or skip errors. Redump requires specific "readers" known to support "subchannel reading" and "overreading into lead-out." The most famous tools are old IDE Plextor drives (like the PX-760A or PX-755) or certain LG GDR-8164B DVD drives.
For years, the Sega Saturn port of Shrek was "undumpable." Every copy failed hashing. Redump investigators discovered that the subchannel data on the official disc contained uninitialized gibberish that varied from minute to minute. They had to develop a new method to "ignore" the dynamic subchannel while validating the static data.
Redump isn't just theory. They have produced tangible wins for history. redump
Factory defects or chemical breakdown separating the physical layers (common in early dual-layer DVDs).
For DVD and Blu-ray-based systems, Redump typically utilizes multi-part .ISO formats or raw .BIN structures depending on the specific system requirements. The Importance of Redump in Video Game Preservation Most standard PC drives will intentionally misread or
Unlike standard ripping software that simply copies files from a disc, Redump focuses on . The goal is to create a 1:1 replica of the original physical media, including hidden data, track structures, and sub-channel information that commercial games used for copy protection. Supported Systems Redump catalogs discs for dozens of platforms, including:
Not all drives are equal. Some, like the Optiarc AD-7200S, are legendary for their ability to read damaged discs perfectly. Redump investigators discovered that the subchannel data on
At its core, Redump provides "blueprints" for game discs. When a member verifies a disc, the project creates a detailed record of its properties: the exact title, the serial number, the version, the regional code, and most importantly, a full set of cryptographic checksums (like CRC32, MD5, and SHA-1) for the entire image. This data, collected in files known as "DATs", serves as a master reference. It allows anyone, anywhere, to verify that a disc image they possess is an exact, bit-for-bit copy of a known good source, free from corruption or data loss.