US 6,982,939 B2
Write compensation for data storage and communication systems
Judith C. Powelson, Alameda, Calif. (US); David K. Warland, Davis, Calif. (US); Ian E. Harvey, Lake Forest, Calif. (US); Yung-Cheng Lo, San Leandro, Calif. (US); Christine Pepin, Menlo Park, Calif. (US); Steven R. Spielman, Oakland, Calif. (US); Ting Zhou, Albany, Calif. (US); and Jonathan A. Zingman, Oakland, Calif. (US)
Assigned to LSI Logic Corporation, Milpitas, Calif. (US)
Filed on Nov. 08, 2001, as Appl. No. 10/12,257.
Application 10/012257 is a continuation in part of application No. 09/496898, filed on Feb. 02, 2000.
Prior Publication US 2002/0126604 A1, Sep. 12, 2002
Int. Cl. G11B 5/09 (2006.01)
U.S. Cl. 369—47.53 62 Claims
OG exemplary drawing
 
33. An optical data storage drive comprising:
a memory storing a write strategy matrix;
a write control circuit configured to control a write laser in accordance with said write strategy matrix;
a read signal transition detector configured to measure the location of read signal transitions;
a processing circuit coupled to said read signal transition detector and configured to update said write strategy matrix using at least in part locations of read signal transitions detected by said read signal transition detector; and
a histogram calculator configured to determine a number of transitions within a selected time window.