Automatic forward sense calibration for writing systems

摘要

Embodiments of optical disc drives are described that perform automatic forward sense calibration of write laser power using a sample and hold sampling strategy that is automatically determined based on an automatically selected write strategy. Embodiments of the described optical disc drive may be dynamically configured to support any optical disc media, any write mode, and any write strategy. The write strategies supported may include dynamically changing write speeds and/or write power levels across the respective optical media tracks. As the optical drive is automatically configured for a selected write media/write mode/write strategy, the sample and hold sampling delays used to control the sampling of a forward sense feedback signal are also automatically configured, thereby allowing each forward sense sampling point to be aligned with an area of the forward sense feedback signal that corresponds to a power level of interest and that avoids distortion in the feedback signal.

主权项

1. A storage drive, comprising:
an encoder module configured to generate encoded run-length data; a strategy module configured to generate write strategy data based on the encoded run-length data, the write strategy data including a write strategy power level corresponding to a logic level represented in the encoded run-length data, and configured to generate a synchronous sampling signal; and a power control module configured to sample a feedback signal based on the synchronous sampling signal and configured to control a drive power level based on the sampled feedback signal, wherein a sampling point within the synchronous sampling signal is based on a last clock cycle associated with a generated write strategy signal pulse and one or more predetermined delays.