Rewritable data storage medium having erasable...

Details Rewritable data storage medium having erasable... Rewritable data storage medium having erasable...

2006-01-10

2006-01-10

Psitos, Aristotelis (Department: 2653)

Dynamic optical information storage or retrieval

Optical storage medium structure

C369S275200

Reexamination Certificate

active

06986150

ABSTRACT:
The rewritable data storage medium (1) has a rewritable recording layer (9) provided with a tracking structure (8). Said layer (9) has a data recording area (5). An erasable identification mark is present in an identification mark area (4, 4′) other than the data recording area (5). The data recording area (5) has a first tracking structure (8′), whereas the identification mark area (4, 4′) is substantially free from a tracking structure or has a second tracking structure (8″) substantially different from the first tracking structure (8′).Thus erasure of the identification mark is practically impossible, because the location of the erasing spot of a recorder cannot be controlled precisely in radial direction.

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Abstract Ozaki Kazuhisa, “Optical Disk and Reproducing Device”, Apr. 1999,vol. 1999, No. 04.

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