Patent ID: 8325439

Claim:
A sequential data storage medium, comprising a sequence of a plurality of servo patterns encoded in a non-data region, wherein each of said servo patterns comprises: a first burst pattern comprising a first pulse comprising a first width, a second pulse comprising a second width, a third pulse comprising a third width, a fourth pulse comprising a fourth width, and a fifth pulse comprising a fifth width; a second burst pattern comprising a sixth pulse comprising a sixth width, a seventh pulse comprising a seventh width, an eighth pulse comprising an eighth width, a ninth pulse comprising a ninth width and a tenth pulse comprising a ten width; a third burst pattern comprising an eleventh pulse comprising an eleventh width, a twelfth pulse comprising a twelfth width, a thirteenth pulse comprising a thirteenth width, and a fourteenth pulse comprising a fourteenth width; a fourth burst pattern comprising a fifteenth pulse comprising a fifteenth width, a sixteenth pulse comprising a sixteenth width, a seventeenth pulse comprising a seventeenth width, and an eighteenth pulse comprising an eighteenth width; wherein widths of said plurality of pulses which comprise said first burst pattern and said second burst pattern, in combination with spacings between said plurality of pulses comprising said first burst pattern and said second burst pattern, encode two bits of data; and wherein widths of said plurality of pulses which comprise said third burst pattern and said fourth burst pattern, in combination with spacings between said plurality of pulses comprising said third burst pattern and said fourth burst pattern, encode one bit of data; wherein: said eleventh width equals said fourteenth width; said twelfth width equals said thirteenth width; said twelfth width is greater than said eleventh width; said third burst pattern and said fourth burst pattern encode a value of “1”.