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OpenAudioCopy

Secure and burst reading

Choose the reading method under OAC → Drive Options → Extraction Method. Secure compares repeated reads and retries difficult sections. Burst copies the audio in one pass. Both methods support AccurateRip.

Complete drive setup before using Secure.

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Secure reading and the Accurate Stream, cache, and C2 drive features.
Select secure readingFull-size image

OAC → Drive Options → Extraction Method

  1. Select Secure for repeated read comparisons.
  2. Run drive-feature detection to set these options.

Choose a recovery quality

Section titled “Choose a recovery quality”

Set Error recovery quality under OAC → OAC Options → Extraction to choose the retry limit.

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Error recovery quality set to High.
Choose how many times to retryFull-size image

OAC → OAC Options → Extraction

  1. Higher recovery quality allows more attempts on difficult sections.
Setting Maximum attempts per reading block
Low 16
Medium 32
High 64

Higher settings spend more time rereading damaged sections.

If too few reads agree at the retry limit, the track fails. The report lists the affected section.

Read comparison and recovery

Section titled “Read comparison and recovery”

Secure mode first compares two reads of a section. If they match and the drive reports no errors, it continues. Differences, incomplete reads, or uncertain read positions trigger further attempts.

Figure 01Read comparison
Read comparisonRead 1 and read 2 both return A B C D in the first example. In the second example, read 2 returns A B X D. OpenAudioCopy rereads the section containing the difference.Matching readsRead 1ABCDRead 2ABCDConsistent readsDiffering frameRead 1ABCDRead 2ABXDReread this section
Read comparisonRead 1 and read 2 both return A B C D in the first example. In the second example, read 2 returns A B X D. OpenAudioCopy rereads the section containing the difference.Matching readsRead 1ABCDRead 2ABCDConsistent readsDiffering frameRead 1ABCDRead 2ABXDReread this section

One letter = one stereo sample frame.

During recovery, OpenAudioCopy checks for agreement every 16 attempts. Each stereo sample frame needs at least six matching, error-free reads and a majority of the reads counted at that position.

Figure 02Recovery at one sample position
Recovery at one sample positionThe examples use 16 separate, aligned disc reads with no reported errors. In the first, nine reads agree on A and seven on B. In the second, six agree on A, five on B, and five on C. Recovery requires at least six matches and more than half of the readings counted for that position.9 of 16 reads agreeAAAAAAAAABBBBBBBUse A9 needed6 of 16 reads agreeAAAAAABBBBBCCCCCMore matches needed9 needed
Recovery at one sample positionThe examples use 16 separate, aligned disc reads with no reported errors. In the first, nine reads agree on A and seven on B. In the second, six agree on A, five on B, and five on C. Recovery requires at least six matches and more than half of the readings counted for that position.9 of 16 reads agreeAAAAAAAAABBBBBBBUse A9 needed6 of 16 reads agreeAAAAAABBBBBCCCCCMore matches needed9 needed

A, B, and C are different sample values.

Audio caching

Section titled “Audio caching”

A drive’s cache holds recently read audio in memory. If the drive returns that stored audio on a second request, an error in the original read will be repeated too.

Figure 03Repeated requests to a caching drive
Repeated requests to a caching driveThe first request reads the disc and stores audio in the cache. A later request returns the stored audio.First requestDiscDrive cacheAudioLater requestDiscDrive cacheStored audio
Repeated requests to a caching driveThe first request reads the disc and stores audio in the cache. A later request returns the stored audio.First requestDiscDrive cacheAudioLater requestDiscDrive cacheStored audio

Leave Cache handling on Auto. OpenAudioCopy uses the detected settings to replace cached audio before comparing reads. If detection is Inconclusive, repeat it with another CD.

Accurate stream

Section titled “Accurate stream”

An accurate-stream drive returns audio at consistent positions when the same section is requested again. For other drives, or when detection is inconclusive, OpenAudioCopy compares overlapping audio to line up the reads.

C2 error pointers

Section titled “C2 error pointers”

C2 pointers mark samples the drive had trouble reading. With C2 enabled, OpenAudioCopy leaves those samples out of the comparison and looks for matches in other reads.

Leave Use C2 pointers on Auto to use the detected setting. C2 testing needs a disc with read errors.

Read the recovery result

Section titled “Read the recovery result”

The report lists read errors and recovery attempts by track and position. See Read the results for the status messages and retry advice.

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