The bookmarks also continue to apply to transcoded streams and alternative data tracks.

So they were able to go all the way from Edison's groove to the digital data track.

A data track of a DVD layer is about 7.5 miles long.

The data track contains continuous groups of nine pulses separated by silence.

The software will recognize the key concerned, and the prime data track will be bypassed.

Two of them contain small data tracks, and one contains the audio tracks.

So that's protected from anyone snooping on the data track.

Typically the first track is a data track while the rest are audio tracks.

This avoids the problem with the data track for most audio players, since they will only be able to recognize the first session.

Mechanical test includes seeking and servo on data tracks.