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Advanced DC-free track code pattern using diphase code for perpendicular recording

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3 Author(s)
Hamaguchi, Takehiko ; R&D Group, Hitachi Ltd., Kanagawa, Japan ; Maeda, H. ; Shishida, K.

We describe an advanced dc-free track code pattern that uses diphase code for a perpendicular recording. Track code error rates are compared between diphase code, dummy-bit code, and conventional dibit code. The diphase code improves writing ability during servo track writing and maintains equivalent medium noise. Therefore, the diphase code exhibits a superior track code error rate within a wide range of radius on experimental hard disk drives.

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Magnetics, IEEE Transactions on  (Volume:41 ,  Issue: 1 )