Logical sector number (LSN) ......... Absolute time 00:02:00 is set to 0 for each sector (frame).
.. Serial number assigned consecutively. 

Frame address (FAD) ......... Absolute time 00:00:00 is set to 0 in units of sectors (frames)
.. Serial number assigned consecutively. There is a one-to-one correspondence with absolute time.
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The logical sector number and frame address have the following relationship.
Logical sector number = frame address-150
∙ Access to the CD block using the frame address as a key.