What if instead we read data of a stationary platter with a stationary reader. We direct the reader using a similar method to a CRT. Basically we have two electromagnets, one for the x and one for the y axis. This shines the light onto the desired position of the platter, which then reflects onto a reflective bowl with a focal point of a sensor.
+---- Sensor
v
-------S------- <-- Platter
\ / <-- reflective bowl
\-----|-----/
^
+---- read laser and CRT like aiming device
We would probably need to sustain data rates of over 1GB/s and storage comparable to existing DVDs to be interesting.