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Optical data storage medium and methods for reading and writing such a medium

  • US 7,027,383 B2
  • Filed: 09/04/2002
  • Issued: 04/11/2006
  • Est. Priority Date: 09/05/2001
  • Status: Expired due to Fees
First Claim
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1. An optical data storage medium (1), having an optically readable information layer, with a first optical reflectivity, said layer having an annular zone (12), with an inner periphery (3) and an outer periphery (4), outside the user data recording area (2), said annular zone (12) having at least one first type (5) of sector extending from said inner periphery to said outer periphery provided with a permanent information mark (7), having a second optical reflectivity different from the first optical reflectivity, characterized in that the annular zone (12) has at least one second type (6) of sector extending from said inner periphery to said outer periphery provided with a recordable identification mark (8), having a third optical reflectivity different from the first optical reflectivity;

  • thereby creating a hybrid annular zone (12) containing both the permanent information mark and the recordable identification mark to save radial space, wherein the recordable identification mark (8) has a physical format and a spatial bit-cell (31) density, which are substantially equal to the physical format and the spatial bit-cell (31) density of the permanent information mark (7).

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