I think two sensors beside one another is enough to  find the direction of
rotation.
At some time both will be sensing the same color but when there will be
change of color below  one of the senser, after some time same change will
be below other one, and from this we can say that the direction of the disk
rotation is from first senser to second senser direction.

hope i am clear...

-- 
Regards
Jitendra Kushwaha
MNNIT, Allahabad

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