A-MIN, A-SEC and A-FRAC fields
These three fields specify an absolute time, viz. the elapsed time from the start of the User Data area to the Section to which these fields belong. It is recorded in minutes in the A-MIN field, in seconds in the A-SEC field and 75th of a second in the A-FRAC field identified by 00 to 74. This absolute time is set to zero in the first Section of the first Information Track of the User Data area. The absolute time increases until the end of the Lead-out Track. The absolute time specifies the position of each Section on the disk and is used for addressing.