Dividing marks in optical media to decrease adjacent track cross

Details Dividing marks in optical media to decrease adjacent track cross Dividing marks in optical media to decrease adjacent track cross

1997-07-21

1999-10-26

Swann, Tod B.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369124, G11B 700

Patent

active

059740221

ABSTRACT:
The present invention includes a method and apparatus for reducing the signal amplitude in long marks which are written into optical disks. When forming a long mark, an increased signal amplitude is typically caused by the blooming toward the end of the mark, and is often sensed by the focused spot in the adjacent track causing increased adjacent track crosstalk (ATC). However, when forming short marks, the effect of blooming is minimized. Therefore, by splitting a long mark into a sequence of short period marks, with short period spaces (1T) between each short period mark, the effect of blooming is substantially reduced.

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