How verification works
OpenAudioCopy compares repeated drive reads, checks tracks against AccurateRip, and reads back the saved files. The extraction report records each result.
Read comparison
Section titled “Read comparison”Secure mode compares reads of the same section and retries when they differ. Consistent reads means the initial reads matched. Recovered by rereading means further attempts produced enough matches.
Run drive setup to detect cache settings before using Secure. For retry limits, see Secure and burst reading.
AccurateRip comparison
Section titled “AccurateRip comparison”AccurateRip stores checksums submitted for audio CD tracks. OpenAudioCopy calculates the v1 and v2 checksums for your tracks and looks for matching records.
Verified means a track matches a confirmed record. Mismatched means neither checksum matches. The results guide lists all statuses and the steps to take for each.
The comparison uses the original CD track positions, including when you save an audio image or change the gap setting.
Confidence
Section titled “Confidence”Confidence is the number of confirmations for a matching AccurateRip checksum. If several records match, OpenAudioCopy reports the highest count for each checksum version.
Which audio is checked
Section titled “Which audio is checked”AccurateRip excludes samples at the start of the first audio track and the end of the last.
Disc ends enlarged.
Missing samples in the checked section give an Incomplete result. A Verified track can have missing samples outside this section. The extraction log lists any audio replaced with silence.
Choose online or offline verification
Section titled “Choose online or offline verification”In the extraction dialog, select Look up verification results online to retrieve AccurateRip records. Clear it to use records saved on your computer.
To supply a downloaded data file, click Load AccurateRip data. Click Clear to remove the loaded file.
Checking the saved files
Section titled “Checking the saved files”OpenAudioCopy reads back WAV files and decodes FLAC files to compare the saved audio with the extracted samples. It also checks the selected FLAC tags and cover. Copy OK confirms that the track file passed these checks.
If encoding or a file check fails, open the compression queue to read the error and retry the task.
Comparing checksums yourself
Section titled “Comparing checksums yourself”Use the report’s PCM CRC-32 or PCM SHA-256 values to compare the audio in two copies. Both copies must contain the same tracks and gaps, and use the same checksum method.
A whole-file checksum covers the audio, tags, and artwork. A PCM checksum covers the decoded audio.
When AccurateRip does not match
Section titled “When AccurateRip does not match”Check the drive’s offset correction, inspect the disc, and extract the affected track again. If it still differs, try another drive and compare the reports.
Different pressings can contain different audio or track positions. Test other discs before changing a drive’s correction.