Frequency modulation pattern for disk drive assemblies

A servo demodulator, comprising:

• a signal processor for generating a position error signal based on a frequency-modulated read-back signal, wherein the frequency-modulated read-back signal continuously varies in accordance to a position of a head assembly relative to a track on a storage medium.

A storage medium, comprising:

• a plurality of radially spaced apart circumferential tracks;
• and
• at least one servo sector disposed on at least one track, the servo sector including a frequency modulation servo pattern encoded thereon, wherein the frequency modulation servo pattern is for producing a read-back signal according to a position of a head assembly relative to a track on the storage medium.

A method of forming a frequency modulation servo pattern on a storage medium, comprising:

• positioning a write head over a predetermined location of the storage medium;
• and
• incrementally moving the write head to form the frequency modulation servo pattern on the storage medium.

A method of forming a frequency modulation servo pattern, comprising preformatting the frequency modulation servo pattern on a storage medium by a process selected from the group consisting of FIB etching, embossing, stamping, photolithography, and electron beam lithography.