Magnetic recording system including differentiated write current emphasis signal generator circuit

A method of writing data to a magnetic storage device, the method comprising:

• receiving write data to be recorded on a magnetic storage device;
• in a channel circuit, identifying emphasis information for falling edges in the write data and identifying emphasis information for rising edges in the write data to yield differentiated emphasis information;
• transmitting the differentiated emphasis information from the channel circuit to a preamplifier;
• in the preamplifier, controlling a characteristic of a write current based upon the differentiated emphasis information;
• and
• recording the write data on the magnetic storage device according to the characteristic, wherein the differentiated emphasis information comprises a mask rising boost and mask falling boost signal configured to identify rising and falling edges in the write data that should not be emphasized in the write current by the preamplifier.

A data processing system comprising:

• means for detecting patterns in write data to be stored on a magnetic storage device and for determining whether falling edges in the write data should be emphasized in a write current and for determining whether rising edges in the write data should be emphasized in the write current to yield a differentiated emphasis signal;
• means for communicating the differentiated emphasis signal from a channel circuit to a preamplifier at a frequency lower than that of the write data wherein the differentiated emphasis signal is communicated to the preamplifier separately from the write data;
• and
• means for recording the write data on the magnetic storage device based at least in part on the differentiated emphasis signal communicated from the channel circuit to the preamplifier.