Land Pre-Pits

Land pre-pits are pre-recorded pits written on the land area between the continuous (wobbled) pre-groove of DVD-R and DVD-RW. In these formats the pre-pits are precisely phase-aligned with the positive peak of the wobble groove detected by the player and their relative positions is modulated according to the data recorded. In DVD-R and DVD-RW, the land-pre pits are modulated with disc information and sector address information.

The DVD-RAM format uses yet another low-level addressing scheme. DVD-RAM is designed for high speed random access in computer data applications and employs pre-mastered zoned sectoring somewhat akin to hard disks with addressing performed through the use of sector address headers.

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