If the information is stored at some value of bits per cm… There’s less bitrate (bits per revolution) in the middle of the record vs the outer edges.
If the information is stored at some value of bits per cm… There’s less bitrate (bits per revolution) in the middle of the record vs the outer edges.
That is just how rotating things work. This is why vehicles need a differential, so that when you turn a corner the inside wheel can rotate at a different speed as the outside wheel.