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By the surface no, it selects the correct surface.

To get the correct sector below the read/write head, the disk is rotated and bring the correct sector with the help of sector number. Once the correct sector, track and surface is decided, the read/write operation starts next.

Suppose that the disk system has 8 data recording surfaces with 4096 track per surface. Tracks are divided into 256 sectors. Then the format of disk address word is:

                                           

Suppose each sector of a track contains 512 bytes of disk recorded serially, then the total capacity of the disk is:
                                 

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