Glossary
AccurateRip
Section titled “AccurateRip”A database of audio CD checksums used to check extracted tracks. Read How verification works.
Audio image
Section titled “Audio image”A file containing the audio from an album or a continuous section of a disc. A CUE sheet records the track positions for playback. See Disc images and CUE sheets.
Burst mode
Section titled “Burst mode”A reading method that copies the audio in one pass. The tracks can be checked against AccurateRip.
C2 pointers
Section titled “C2 pointers”Error markers sent by the drive for samples it had trouble reading.
Checksum
Section titled “Checksum”A number calculated from data, used to compare copies. CRC-32 and SHA-256 are checksum methods.
Confidence
Section titled “Confidence”The number of confirmations reported with an AccurateRip database record. OpenAudioCopy shows the highest count among matching records for each checksum version.
CUE sheet
Section titled “CUE sheet”A text file that tells a player where tracks and indexes begin in the accompanying audio files.
A lossless audio format that compresses audio while preserving its samples. FLAC files can also store album tags and cover artwork.
Metadata
Section titled “Metadata”Information about the recording, such as album title, artist, track names, and cover artwork. It is used for filenames and tags. See Metadata and artwork.
Offset correction
Section titled “Offset correction”An adjustment for a drive that consistently reads a little before or after the requested position. It is measured in stereo sample frames.
Pulse-code modulation. Audio represented as a sequence of numerical samples. CD audio uses 16-bit stereo samples at 44,100 frames per second.
Pregap
Section titled “Pregap”Audio before a track’s INDEX 01 start, often marked by INDEX 00. It may contain silence, speech, or music.
Preset
Section titled “Preset”A saved set of output options, such as FLAC compression level, tags, and cover artwork.
Sample frame
Section titled “Sample frame”The samples for all channels at one instant. A stereo CD sample frame contains one left and one right 16-bit sample, occupying four bytes.
Sector
Section titled “Sector”A CD audio block containing 588 stereo sample frames, or 2,352 audio bytes. There are 75 sectors per second.
Secure mode
Section titled “Secure mode”A reading method that compares separate reads of the same audio and retries sections that disagree or report errors. See Secure and burst reading for the matching rules and retry limits.
Table of contents
Section titled “Table of contents”The disc information describing track positions and session boundaries. Often abbreviated as TOC.
An audio file format. OpenAudioCopy writes WAV files containing uncompressed CD audio.