Identifying optical disc properties from information read from label side of optical disc

• US 7,394,738 B2
• Filed: 03/20/2002
• Issued: 07/01/2008
• Est. Priority Date: 03/20/2002
• Status: Expired due to Fees

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Anderson, Daryl E., Kwasny, David M.
• Primary Examiner(s): Young; Wayne
• Assistant Examiner(s): GIESY, ADAM
• Application Number:
  US10/103,043
• Publication Number:
  US 20030179674A1
• Time in Patent Office: 2,295 Days
• Field of Search: 369/30.36, 369/52.1, 369/53.22, 369/53.37, 369/53.21, 369/273, 720/729
• US Class Current: 369/53.21
• CPC Class Codes: G11B 19/12 by sensing distinguishing features of or on records, e.g. diameter end mark
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/00876 wherein physical copy protection means are attached to the medium, e.g. holograms, sensors, or additional semiconductor circuitry
• CPC Class Codes: G11B 23/284 on the record carrier
• CPC Class Codes: G11B 23/30 with provision for auxiliary signals
• CPC Class Codes: G11B 23/40 Identifying or analogous means applied to or incorporated in the record carrier and not intended for visual display simultaneously with the playing-back of the record carrier, e.g. label, leader, photograph
• CPC Class Codes: G11B 7/0037 with discs
• CPC Class Codes: G11B 7/00736 Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information sector headers or adresses in prepits G11B7/00745; address data in track wobble G11B7/24082

Abstract

Identifying optical disc properties from information read from the label side of an optical disc is disclosed. The information from the label side of an optical disc is first read. From this information read from the label side of the optical disc, one or more properties of the optical disc are then identified.

Claims

1. A method comprising:

reading a signal as reflected by a label side of an optical disc, without reading any indicia on the label side of the optical disc, an indicia defined as data encoded within an encoded data format;

attempting to identify one or more properties of the optical disc from the signal reflected by the label side of the optical disc;

where the one or more properties cannot be identified from the signal reflected by the label side of the optical disc,

writing a mark to the label side of the optical disc, the mark being one of a pixel written sufficiently small to escape casual detection by a user and a mark written to a border of the label side of the optical disc;

reading a second signal reflected by the mark written to the label side of the optical disc; and

,

identifying the one or more properties of the optical disc from the second signal reflected by the mark written to the label side of the optical disc.

2. A method comprising:

reflecting a signal off a side of an optical disc initially presumed to be a label side of the optical disc with a laser, without reading any indicia on the label side of the optical disc, an indicia defined as data encoded within an encoded data format;

attempting to identify properties of a label side of the optical disc based on the signal, where the side of the optical disc is the marking or imaging surface of the optical disc;

where the one or more properties cannot be identified from the signal reflected by the label side of the optical disc,

writing a mark to the label side of the optical disc, the mark being one of a pixel written sufficiently small to escape casual detection by a user and a mark written to a border of the label side of the optical disc;

reading a second signal reflected by the mark written to the label side of the optical disc; and

,

identifying the one or more properties of the optical disc from the second signal reflected by the mark written to the label side of the optical disc.

3. The method of claim 2, further initially comprising:

determining whether the side of the optical disc is the data side; and

,

in response to determining that the side of the optical disc is other than the data side, proceeding with reflecting the signal off the side of the optical disc.

4. The method of claim 3, wherein determining whether the side of the optical disc is the data side comprises detecting pits and grooves on the side of the optical disc associated with the data side.

5. The method of claim 3, wherein determining whether the side of the optical disc is the data side comprises detecting data tracks on the side of the optical disc.

6. A system comprising:

a mechanism receptive to an optical disc and in which the optical disc is rotatable;

a laser to at least detect a signal reflected by a label side of the optical disc without reading any indicia on the label side of the optical disc, an indicia defined as data encoded within an encoded data format; and

,

a controller to at least attempt to identify one or more properties of the label side of the optical disc from the signal detected by the laser,

wherein where the controller is unable to identify the one or more properties from the signal reflected by the label side of the optical disc,

the controller is to direct the laser to write a mark to the label side of the optical disc, the mark being one of a pixel written sufficiently small to escape casual detection by a user and a mark written to a border of the label side of the optical disc,

the laser is to read a second signal reflected by the mark written to the label side of the optical disc; and

,

the controller is to identify the one or more properties of the optical disc from the second signal reflected by the mark written to the label side of the optical disc.

7. The system of claim 6, wherein the properties of the label side of the optical disc comprise properties for writing on the label side of the optical disc with the laser.

8. The system of claim 6, wherein the label side of the optical disc includes no indicia written thereto.

9. The system of claim 6, wherein the laser is further to write information to the label side of the optical disc.

10. The system of claim 6, wherein the mechanism, the laser, and the controller are encased in an enclosure internally connectable to a computer.

11. The system of claim 6, wherein the mechanism, the laser, and the controller are encased in an enclosure externally connectable to a computer.

12. The system of claim 6, wherein the mechanism, the laser, and the controller are part of a computer.

13. A computer-readable medium having a computer program stored thereon comprising:

first means for directing a laser to at least detect a signal reflected by a label side of a rotating optical disc without reading any indicia on the label side of the rotating optical disc, an indicia defined as data encoded within an encoded data format; and

,

second means for attempting to identify one or more properties of the label side of the rotating optical disc from the signal reflected by the laser,

wherein where the second means is unable to identify the one or more properties from the signal reflected by the label side of the optical disc,

the first means is to direct the laser to write a mark to the label side of the optical disc, the mark being one of a pixel written sufficiently small to escape casual detection by a user and a mark written to a border of the label side of the optical disc,

the laser is to read a second signal reflected by the mark written to the label side of the optical disc; and

,

the second means is to identify the one or more properties of the optical disc from the second signal reflected by the mark written to the label side of the optical disc.

14. The medium of claim 13, wherein the means for directing the laser is further for directing the laser to write information to the label side of the rotating optical disc.