Infineon Technologies Ag

Heiner Stockmanns

William G Bliss

Razmik Karabed

James Wilson Rae

Kaichi Zhang

James W Rae

A method and apparatus for handling end of data processing in a data storage device. The method includes receiving a plurality of user data bits at a write channel. The method further includes appending primary padding bits to user data bits if the plurality of user data bits is less than a multiple of an input block length of an encoder in the write channel and encoding the plurality of user data bits and any primary padding bits into a plurality of encoded data bytes. Additionally, the method includes appending an end of data marker to an end of the plurality of encoded data bytes, wherein the end of data marker has a length of no more than one byte, and writing the plurality of encoded data bytes and the end of data marker to the data store.

Method and apparatus for handling end of data processing in a data storage device

A method and apparatus for Viterbi detector state metric re-normalization. The method includes fabricating a Viterbi detector ( ) having a predetermined number of states, wherein the Viterbi detector ( ) stores a state metric value and a branch metric value for each state, and wherein the Viterbi detector ( ) implements a trellis diagram. The method includes constructing a Viterbi detector ( ) which can support a state metric value having g&plus;h&prime; number of bits. The number of bits needed to represent the branch metric value is represented by (g) and the additional number of bits needed to represent the state metric value is represented by (h&prime;). The additional number of bits (h&prime;) is less than the additional number of bits (h) determined using the following inequality: 2 &minus;h&gE;K&minus;1, wherein K represent the constraint length of the trellis diagram.

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Santa Cruz, CA, United States of America

Heiner Stockmanns