1.Land & Groove

A trench-like feature of the disk, this is used to define the track location. The groove is located nearer to the entrance surface than the land. The recording is made in the groove.

2.Wobble

continuous sinusoidal deviation of the track from the average centerline.

Wobbled Land Groove Recording assimilated both merits from Wobbled Groove Recording and Land Groove Recording. The data is recorded on the wobbled 0.615 micron land and groove, and the address information is retrieved from the pit on the prestructured media. DVD forum authorised this Wobble Land Groove recording as the official format for DVD-RAM.

4.Wobbled Groove recording --- DVD-RW format

The advantage of Wobbled Groove recording is its durability to tiny defect. The data and the address are saved on the wobbled groove.