An integrated circuit connectable to a signal transmission path of a storage device includes an impedance setting circuit including a plurality of switches, a detector configured to detect an input signal level, and a decoder. The decoder controls one or more switches of the impedance setting circuit based on the detected input signal level so as to match an impedance of the integrated circuit with an impedance of the signal transmission path.

An integrated circuit connectable to a signal transmission path of a storage device includes an impedance setting circuit including a plurality of switches, a detector configured to detect an input signal level, and a decoder. The decoder controls one or more switches of the impedance setting circuit based on the detected input signal level so as to match an impedance of the integrated circuit with an impedance of the signal transmission path.

First and second signal patterns are used to write corresponding portions of first and second adjacent tracks to a magnetic storage medium. A characteristic of the first signal pattern is changed based on the second signal pattern, the changing of the characteristic reducing an adjacent track interference affecting the second track.

Systems, methods, and computer readable media are described for effectively using dither techniques upon signals having a predicted quantization error that varies across the range of the signal. In some embodiments, predicted error is used to shape a precision input signal so that the newly-shaped signal yields a uniform or relatively uniform predicted quantization error. A dither is applied to the re-shaped signal, and the shaping is reversed, after which the signal may be slope limited and/or quantized, taking full and efficient advantage of the dithering technique.

According to one embodiment, an information processing device includes an acquisitor and a processor. The acquisitor is configured to acquire a reproduced signal based on a signal obtained from a magnetic recording medium. The reproduced signal includes first input data, second input data, and third input data. The processor is configured to perform a first process and a second process. In the first process, the processor is configured to derive a first derived feature value from a first inner product of a first feature value based on the first input data and a second feature value based on the second input data. In the second process, the processor is configured to derive a second derived feature value from a second inner product of a third feature value based on the third input data and the first derived feature value.

A method and apparatus is provided for extending a read bandwidth and increasing a high-frequency signal-to-noise ratio (SNR) of a front-end of a read path of a hard disk drive (HDD) by introducing a high impedance section at the front-end of the read path. The high impedance section may mitigate capacitive effects found at the front-end of the read path, thereby improving signal transfer by extending the read bandwidth.

A system and method for Flex Over or On Suspension (FOS) fault detection under a write gate for magnetic disk drives may employ a flex over suspension fault comparator that compares a predetermined reference threshold to a positive delta of a disk drive write head data stream and outputs a positive or negative FOS fault indication. A max/min buffer detects polarity of a disk drive read/write head and applies a positive buffered delta to the fault comparator. A transition-free window detector triggers the fault comparator to output the fault indication when a transition-free window of zero-value data bits of a predetermined length is detected from the disk drive head, and the transition-free window detector provides a fault validation signal to validate output of the fault comparator when the transition-free window of zero-value data bits of the predetermined length is detected from the disk drive head.

According to one embodiment, an information processing device includes an acquisitor and a processor. The acquisitor is configured to acquire a reproduced signal based on a signal obtained from a magnetic recording medium. The reproduced signal includes first input data, second input data, and third input data. The processor is configured to perform a first process and a second process. In the first process, the processor is configured to derive a first derived feature value from a first inner product of a first feature value based on the first input data and a second feature value based on the second input data. In the second process, the processor is configured to derive a second derived feature value from a second inner product of a third feature value based on the third input data and the first derived feature value.

Embodiments of a sampling system and a method for sampling are disclosed. In an embodiment, a sampling system includes sampling cells, the sampling cells are distributed into sampling channels, and the sampling cells in the sampling channels are driven by sampling clock pulses with respective phase offsets.