Abstract: There is provided a memory device including a memory cell configured to store an input data bit written thereto; a memory sensor configured to sense a parameter associated with a state of the memory cell; a detector configured to determine, based on the parameter sensed from the memory cell, a first soft information indicating the likelihood that the input data bit written to the memory cell is a predefined value; and a decoder configured to generate an output data bit of the memory cell based on the first soft information. In particular, the detector includes a first detector configured to determine the first soft information based on a second soft information indicating the likelihood that the state of the memory cell corresponds to a value of the input data bit written to the memory cell.

Abstract: According to various embodiments, a joint detector/decoder device may be provided. The joint detector/decoder device may include: an input circuit configured to receive an input signal; a splitting determination circuit configured to determine whether a survivor is to be split based on a parity check criterion; and a survivor splitting circuit configured to produce a plurality of survivors of a next instance based on at least one survivor of a previous instance and based on the input signal, if it is determined that the survivor of the previous instance is to be split; wherein each survivor has an associated bit sequence.

Abstract: A method including determining a first frequency for (i) a first track in a servo layer of a storage medium, or (ii) a first sector in the servo layer. The servo layer is dedicated to storing servo information. The method further includes: obtaining first address information addressing the first track or the first sector; modulating the first address information according to the first frequency; and storing the modulated first address information in the servo layer. Subsequent to the storing of the modulated first address information, the servo information includes the modulated first address information.

Abstract: A method including determining a first frequency for (i) a first track in a servo layer of a storage medium, or (ii) a first sector in the servo layer. The servo layer is dedicated to storing servo information. The method further includes: obtaining first address information addressing the first track or the first sector; modulating the first address information according to the first frequency; and storing the modulated first address information in the servo layer. Subsequent to the storing of the modulated first address information, the servo information includes the modulated first address information.

Abstract: There is provided a method of predicting a noise component associated with a readback signal in a channel from a dedicated servo medium including a data recording layer and a dedicated servo layer. The method including: providing at least one noise prediction module for each of a plurality of types of servo patterns of the servo layer, and predicting the noise component by, for each of a plurality of segments of the readback signal of the data recording layer, using a selected one of the noise prediction modules. In particular, the selected one of the noise prediction module for a segment of the readback signal is selected based on the type of the servo pattern associated with the segment of the readback signal. There is also provided a corresponding noise predictor, a method of detecting data bits from the readback signal, and a hard disk drive system.

Abstract: According to an embodiment of the present invention, a data storage device comprising a motor having a stator is disclosed. The stator may include a substrate having a first surface and a second surface opposite to the first surface; and a n-phase winding arrangement having n phase windings; wherein each phase winding comprises m flat fractional-pitch coils arranged on the first surface of the substrate such that the coils are spaced apart uniformly along a closed loop and connected in series; wherein each coil together with an angular section of the substrate between the coil and an adjacent coil of the same phase winding defines a stator pole-pair; and wherein m is an integer larger than 1.

Abstract: According to embodiments of the present invention, a storage medium is provided. The storage medium includes a dedicated servo layer including a plurality of servo tracks, wherein at least one of the plurality of servo tracks includes a modulated address information including an address information being modulated by at least one frequency associated with the at least one of the plurality of servo tracks. According to further embodiments of the present invention, a modulator for a storage medium, a demodulator for a storage medium, a data storage device and a method of processing address information for a data storage device are also provided.

Abstract: There is provided a method of predicting a noise component associated with a readback signal in a channel from a dedicated servo medium including a data recording layer and a dedicated servo layer. The method including: providing at least one noise prediction module for each of a plurality of types of servo patterns of the servo layer, and predicting the noise component by, for each of a plurality of segments of the readback signal of the data recording layer, using a selected one of the noise prediction modules. In particular, the selected one of the noise prediction module for a segment of the readback signal is selected based on the type of the servo pattern associated with the segment of the readback signal. There is also provided a corresponding noise predictor, a method of detecting data bits from the readback signal, and a hard disk drive system.

Abstract: According to various embodiments, a joint detection/decoder device may be provided. The detector and decoder device may include: an input circuit configured to receive an input signal; a survivor splitting circuit configured to produce a plurality of survivors of a next instance based on at least one survivor of a previous instance and based on the input signal; and a survivor discarding circuit configured to discard survivors based on a set of predetermined criteria; wherein each survivor has an associated bit sequence.

Abstract: According to an embodiment of the present invention, a data storage device comprising a motor having a stator is disclosed. The stator may include a substrate having a first surface and a second surface opposite to the first surface; and a n-phase winding arrangement having n phase windings; wherein each phase winding comprises m flat fractional-pitch coils arranged on the first surface of the substrate such that the coils are spaced apart uniformly along a closed loop and connected in series; wherein each coil together with an angular section of the substrate between the coil and an adjacent coil of the same phase winding defines a stator pole-pair; and wherein m is an integer larger than 1.

Abstract: A method and system for estimating the position error signal (PES) metric for a magnetic storage system. The method comprises the steps of reading multiple readback tracks from a storage medium of the magnetic storage system using respective readers of a multiple reader head positioned at or near a data track of interest; employing an adaptive SMR equalizer to equalize the signals from the multiple read head; and extracting information from the adaptive SMR equalizer sub-filters as an estimate of the PES metric.

Abstract: According to embodiments of the present invention, a storage medium is provided. The storage medium includes a dedicated servo layer including a plurality of servo tracks, wherein at least one of the plurality of servo tracks includes a modulated address information including an address information being modulated by at least one frequency associated with the at least one of the plurality of servo tracks. According to further embodiments of the present invention, a modulator for a storage medium, a demodulator for a storage medium, a data storage device and a method of processing address information for a data storage device are also provided.

Abstract: According to various embodiments, a joint detection/decoder device may be provided. The detector and decoder device may include: an input circuit configured to receive an input signal; a survivor splitting circuit configured to produce a plurality of survivors of a next instance based on at least one survivor of a previous instance and based on the input signal; and a survivor discarding circuit configured to discard survivors based on a set of predetermined criteria; wherein each survivor has an associated bit sequence.

Abstract: According to embodiments of the present invention, a method for demodulating a position error signal from a readback servo signal having a first frequency associated with a first servo track of a storage medium and a second frequency associated with a second servo track adjacent to the first servo track is provided. The method includes sampling the readback servo signal at successive time instants to provide a sequence of samples, computing a Discrete Fourier Transform based on the sequence of samples, and providing a measurement indicative of the position error signal based on the Discrete Fourier Transform. According to further embodiments of the present invention, a demodulator is also provided.

Abstract: According to embodiments of the present invention, a data storage device is provided. The data storage device includes a recording channel configured to carry a signal; a detector configured to detect the signal from the recording channel; and a noise prediction circuit configured to predict noise affecting the recording channel and the detected signal based on a noisy channel model. According to further embodiments of the present invention, a method of processing a signal in a data storage device is also provided.