Preformatted guide tracks and co-written control tracks for multichannel optical recording
First Claim
1. A method for multi-track optical data recording, comprising the steps of:
- a) providing an optical head and an optical recording medium that includes a plurality of parallel, preformatted guide tracks, with sufficient space between adjacent guide tracks for recording a plurality of data tracks;
b) providing relative motion between the optical recording medium and the optical head in a direction generally parallel to the guide tracks;
c) imaging a guide track onto a detector array disposed relative to the optical recording medium, generating a first tracking error signal representing the cross-track displacement of the guide track relative to the optical head, and driving a closed-loop servo system to reduce residual tracking runout of the guide track; and
d) simultaneously recording a band of data tracks in the unpreformatted space adjacent to the guide track and one or more control tracks parallel to the data tracks.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for multi-track optical data recording comprising the steps of providing an optical recording medium that includes a plurality of parallel, preformatted guide tracks, with sufficient space between adjacent guide tracks for recording a plurality of data tracks; providing relative motion between the optical recording medium and an optical head in a direction generally parallel to the guide tracks; imaging a guide track onto a detector array disposed relative to the optical recording medium; and generating a first tracking error signal representing the cross-track displacement of the guide track relative to the optical head. The method further comprises driving a closed-loop servo system to reduce the residual tracking runout of the guide track and simultaneously recording a band of data tracks in the unpreformatted space adjacent to the guide track and one or more control tracks parallel to the data tracks.
26 Citations
9 Claims
-
1. A method for multi-track optical data recording, comprising the steps of:
-
a) providing an optical head and an optical recording medium that includes a plurality of parallel, preformatted guide tracks, with sufficient space between adjacent guide tracks for recording a plurality of data tracks;
b) providing relative motion between the optical recording medium and the optical head in a direction generally parallel to the guide tracks;
c) imaging a guide track onto a detector array disposed relative to the optical recording medium, generating a first tracking error signal representing the cross-track displacement of the guide track relative to the optical head, and driving a closed-loop servo system to reduce residual tracking runout of the guide track; and
d) simultaneously recording a band of data tracks in the unpreformatted space adjacent to the guide track and one or more control tracks parallel to the data tracks. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A preformatted optical recording medium comprising:
-
a) a plurality of parallel, segmented guide tracks;
b) sufficient unformatted space between adjacent guide tracks for recording of a plurality of data tracks; and
c) unformatted gaps between successive segments of each guide track having approximately the same lengths as the guide track segments. - View Dependent Claims (9)
-
Specification