Double pulse write driver

A method of writing data to a data storage medium via a write head, said method comprising the steps of:

• receiving data signals from a host data source;
• writing said data signals to a first buffer;
• writing said data signals to a delay device;
• reading delayed said data signals from said delay device;
• writing said delayed data signals to a second buffer;
• inverting said delayed data signals;
• adding said first buffered data signals to said delayed, buffered and inverted data signals to obtain a modified data write signal;
• and
• performing a write operation to write said modified data write signal to said data storage medium via said write head.

A method of driving a write head in a data storage device, said method comprising the steps of:

• receiving an incoming stream of data signals from a host data source;
• delaying said data signals by a predetermined delay period;
• adding said data signals and said delayed data signals to produce a modified data write signal;
• and
• driving a write head using said modified data write signal,
• wherein said modified data write signal contains frequency components arranged to compensate at least partially for a frequency response roll off of said write head.

A method for at least partially compensating for higher frequency roll-off in the frequency response of a write head, comprising the steps of:

• providing a write signal;
• generating therefrom a first write current signal having a first amplitude;
• delaying and inverting the write signal for generating a second write current signal having a second amplitude that is less than the first amplitude;
• summing the first write current signal and the second write current signal to produce a modified write current signal having current transients at rising and falling transitions thereof for increasing high frequency components of the modified write current signal for approximating a frequency spectrum of a write current having a uniform amplitude over a range of frequencies;
• and
• applying the modified write current signal to the write head.

A data storage device for storing data signals, said device having a write channel comprising:

• a write head for writing said data signals, and write pre-equalization means for compensating for a frequency response roll-off of said write head, said write pre-equalization means comprising:
• means for delaying said data signal;
• means for setting a relative amplitude of said data signals and said delayed data signals;
• and
• means, coupled to said setting means, for adding said data signals and said delayed data signals to form a modified data write signal which is input to said write head, said modified data write signal further comprising a relatively short higher amplitude spike on a leading edge of a main pulse of said signal, said relatively short higher amplitude spike introducing higher frequency components which compensate for a higher frequency roll-off of said write head.

A method of writing data to a data storage medium via a write head, said method comprising:

• receiving data signals from a host data source;
• writing said data signals to a first buffer;
• writing said data signals to a delay device;
• reading delayed said data signals from said delay device;
• writing said delayed data signals to a second buffer;
• inverting said delayed data signals;
• adding said first buffered data signals to said delayed, buffered and inverted data signals to obtain a modified write pre-equalization data write signal which comprises a relatively short higher amplitude spike on a leading edge of said modified signal and which introduces higher frequency components to compensate for a higher frequency roll-off of said write head;
• and
• performing a write operation to write said modified data write signal to said data storage medium via said write head.

A method of driving a write head in a data storage device, said method comprising:

• receiving an incoming stream of data signals from a host data source;
• delaying said data signals by a predetermined delay period;
• adding said data signals and said delayed data signals to produce a modified write pre-equalization data write signal, said modified signal comprising a relatively short higher amplitude spike on the leading edge of a main pulse of said signal which introduces higher frequency components to compensate for a higher frequency roll-off of said write head;
• and
• driving a write head using said modified data write signal,
• wherein said modified data write signal contains frequency components arranged to compensate at least partially for a frequency response roll-off of said write head.

A write pre-equalization method for at least partially compensating for higher frequency roll-off in the frequency response of a write head, said method comprising:

• providing a write signal;
• generating therefrom a first write current signal having a first amplitude;
• delaying and inverting the write signal for generating a second write current signal having a second amplitude that is less than the first amplitude;
• summing the first write current signal and the second write current signal to produce a modified write current signal having current transients at rising and falling transitions thereof for increasing high frequency components of the modified write current signal for approximating a frequency spectrum of a write current having a uniform amplitude over a range of frequencies;
• and
• applying the modified write current signal to the write head.