Audio CD Ripper Drive Settings

C2 Pointers supported

Drive is capable of reporting C2 data errors.

CD-DA stream is accurate

Drive is able to provide accurate audio stream and can report synchronization errors. "Accurate CD-DA Stream"

Cache size

Cache memory size of the drive. Cache helps improve the speed of read and write operations during disc access and ripping.

Enable Error Detection

When enabled, the CD ripper performs low-level verification during audio extraction to identify and report errors caused by disc defects, drive limitations, or read instability.

Audio CDs do not include strong built-in error correction for audio data (unlike data CDs), so the ripper must detect problems by analyzing the consistency and reliability of the data returned by the drive.

The following types of errors are monitored:

• Read Errors - Occur when the drive is unable to reliably read sectors from the disc due to scratches, dirt or physical damage. These may result in missing or interpolated samples.
• Synchronization Errors - Detected when sector alignment is inconsistent between reads. The ripper verifies that audio data is read at the correct offsets and in the proper sequence. Misalignment may indicate jitter or inaccurate stream positioning.
• Data Errors - Identified by comparing multiple reads of the same audio sectors. If the returned data differs between passes, the ripper flags the sector as unreliable, indicating potential uncorrected errors.

To improve accuracy, the ripper may re-read problematic sectors and compare results to confirm data integrity. Persistent mismatches are reported as errors.

Detected errors are logged and can be used to evaluate the quality of the rip. A clean rip should contain no reported errors, while reported issues may indicate audible artifacts in the resulting audio.

Method

Both C2 #1 and C2 #2 use the same C2 error detection technique, but differ in the hardware command interface used to access it.

C2 #1 is the default option and is compatible with most CD/DVD/BD drives. It should be used first in normal situations.

If you experience issues such as read errors or unusually slow ripping, switching to C2 #2 may improve compatibility, as some drives respond better to the alternative command set.

Enable drive spin-up

Spin up the CD drive to full speed before starting the ripping process. This allows the disc to reach a stable read speed, which can improve reading reliability and reduce errors at the start of extraction. Specify how many seconds the drive should spin up before ripping begins.

Use Sample Offset Correction

Audio CDs do not store absolute alignment information for the exact start position of audio samples within sectors. As a result, CD drives read audio data with a consistent positional offset, meaning the returned samples are shifted slightly earlier or later than the intended reference position.

This offset is a property of the drive’s hardware and typically ranges from 0 to ±1000 samples. One audio sample at 44.1 kHz corresponds to 1/44100 of a second (approximately 22.7 microseconds). For example, an offset of 500 samples equals about 11.3 milliseconds.

During ripping, this offset causes the extracted audio to be shifted in time, but no audio data is lost, only its alignment changes. Because the shift is extremely small, it is not audible during normal listening and does not affect perceived sound quality. The same behavior exists in standard CD players.

Sample offset correction compensates for this shift by adjusting the read position so that extracted audio matches a consistent reference alignment.

This is primarily important for verification and accuracy purposes. When the correct offset is configured, rips from different drives can be directly compared using checksums (CRC). Matching CRC values indicate that the audio data is identical and accurately extracted.

For casual listening, offset correction is not required. For archival use, accurate verification, or comparison between different drives, enabling sample offset correction is recommended.

Get offset

Retrieves the sample offset for your drive from AccurateCDDA database.

Verify Audio

Performs a two-pass CRC verification by reading each sector of audio data twice and calculating checksums for both reads. The results are compared to detect read inconsistencies and identify any errors with precise position information.

This mode also bypasses the drive’s internal cache, ensuring data is read directly from the disc rather than reused from memory, which improves accuracy during extraction.

If both passes produce identical CRC values, it confirms that the rip is consistent and highly reliable, indicating that the extracted audio matches the original CD data.

Verify Data

Data tracks are read twice and CRC checksums are generated for each pass. The results are compared to verify data consistency. Matching CRC values indicate that both reads produced identical results, confirming that the extracted data is accurate and matches the original disc content.