What is an read or write offset? When do they occur?
During extraction or writing of the audio data, nearly all CD-ROM/CD-R drives will add an offset to the position. This is usually around 500-700 audio samples (ca. 1/75 second) on reading and around 0-18 samples on writing (ca. 1/1000 second). So if a program queries a specific sector, it will not receive exactly that sector, but shifted with the number of samples of the offset.
