Texas Instruments Corporation

Inphase Technologies, Inc.

Daniel D Woods

Keith W Malang

Zachary A Keirn

Michael James

Stephen J Bassett

Zak Keirn

According to one aspect, a holographic storage system including micro-actuators is presented. In one example of one aspect of the invention, the device includes a spatial light modulator, a detector, a storage medium, and at least one micro-actuator configured to move at least one of the spatial light modulator, the detector, and the storage medium. The micro-actuators may include a servomechanism or the like to control the positioning of a component based on feedback associated with a misalignment of a detected image. According to another aspect of the invention, various methods for determining component misalignments of a holographic storage system are presented.

Micro-positioning movement of holographic data storage system components

A method for performing error correction code operations on data to be read from the disk ( ) of a hard disk drive ( ) includes applying a first error correction code algorithm to a first set of data to be written to the hard disk drive, and a second error correction code algorithm, different from the first, to a second set of data to be written to the hard disk drive ( ). The first and second error correction code algorithms may for example produce a different number of error correction code bits for application to said data. The selection between the first and second algorithms may be made, for instance, in dependence upon the physical locations ( ) on the disk, or in dependence upon the type of said data ( ) to be written. By reducing the number of ECC bits that need be associated with at least some of the data to be written to the disk ( ), the available space on the disk for user data can be increased.

Error correction codes applied variably by disk zone, track, sector, or content

The present invention relates to a method of providing error margin information for threshold errors associated with a digital peak detector. The method comprises comparing a plurality of peak sample values associated with the digital peak detector to a threshold margin test level and incrementing a counter each time the threshold margin test level exceeds one of the plurality of peak sample values. The value associated with the counter relates to an amount of threshold margin associated with the digital peak detector. The present invention also relates to a method of providing error margin information for peak shift errors associated with a digital peak detector. The method comprises identifying relevant peak sample data points associated with each of a plurality of detected peaks and determining a peak shift amplitude associated with each of the detected peaks using the identified relevant peak sample data points. The method further comprises comparing the peak shift amplitudes associated with the detected peak to a peak shift test level and incrementing a counter each time the peak shift amplitudes associated with the detected peaks exceed the peak shift test level. The value associated with the counter relates to an amount of peak shift margin associated with the digital peak detector.

Channel quality monitor (CQM) for digital peak detection (DPD)

An encoding scheme to translate user information into encoded information, including the steps of receiving the user information and translating the user information into encoded information by employing a new kind of Run Length Limited encoding scheme. The user information and the encoded information have the same cell size.

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Longmont, CO, United States of America

Daniel D Woods