Methods/Materials
First a red laser pointer was used to measure the data track spacing on all of the CDs. Then a green laser
pointer was used to measure the data track spacing on all of the CDs. A red laser pointer was used to
measure the data track spacing on all of the DVDs. After that, a green laser pointer was used to measure
the data track spacing on all of the DVDs. Finally all of the data track spacings were averaged and a result