Patent ID: 7978589

Claim:
A write analysis module for an optical drive, the optical drive including an optical storage medium, the write analysis module comprising: a signal receive module configured to receive one or more signals corresponding to light reflected from the optical storage medium, wherein the light reflected from the optical storage medium is modulated with both i) data currently being written to the optical storage medium and ii) data previously written to the optical storage medium; a filter configured to receive the one or more signals corresponding to the light reflected from the optical storage medium, and generate a filtered signal by filtering the one or more signals in accordance with a filtering characteristic of the filter; and a filter control module configured to receive a current write signal corresponding to the data currently being written to the optical storage medium, and adjust the filtering characteristic of the filter based on the current write signal so that i) the filtered signal substantially contains only the data previously written to the optical storage medium and not the data currently being written to the optical storage medium; and a read-back module configured to compare the filtered signal to data intended to have been previously written to the optical storage medium.