DVD+-+ROM

• (greater storage availability than other disks.) • On a CD the minimum length per pit is 0.834um, but on a DVD it is only 0.4um. • Also the spiral spacing of the data tracks on a DVD is 0.74um, whereas on a CD it is only 1.6um. • DVD lasers have a sorter wave length to read the data. • The lasers used are identical to those in bar code readers • You can use more than 1 layer of storage on a DVD • Typical capacity is 4.7GB