A data recording apparatus capable of properly managing contents of data and reproduction information even if a portion of the data is deleted. If a portion of Clip is deleted so that an ATC-sequence becomes discontinuous, the value of offset_STC_id for an STC-sequence at the beginning of the ATC-sequence is set so that the value of stc_id of each STC-sequence following the ATC discontinuity does not change. The stc_id of an STC-sequence is an ID for identifying the STC-sequence.
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