Starting Position of a Data CD Disk

Hi,

I have been told that a data cd (also audio cd) is
first "read" from the middle track. Another person told me
that it is first "read" from the inside track. I always thought
it was first read from the outside (near the edge) track.

Can someone, who really knows, tell me where the
first "reading" (when you insert a CD) takes place?

Thanks in advance, Brad

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