Abstract: A method to encode information holographically, wherein the method provides information, and generates a plurality of data images, wherein each data image comprises a portion of the information. The method holographically encodes each of the plurality of data images in a holographic data storage medium, generates a plurality of identifiers, and associates a different one of the plurality of identifiers with a different one of the plurality of data images. The method forms a directory image reciting each of plurality of identifiers, encodes the directory image in a non-holographic data storage medium, and holographically encodes the directory image in the holographic data storage medium.

Abstract: A method is presented to rotate a read/write head rotatable along a first axis and comprising a first assembly having a first servo element and a second servo element. The method moves a sequential information storage medium adjacent to the read/write head along a second axis, wherein the second axis is substantially orthogonal to the first axis, and determines the rotation angle for the read/write head with respect to the sequential information storage medium using the first servo element and the second servo element. The method then positions the read/write head with respect to the second axis based upon the rotation angle.

Abstract: A method to store information in a holographic data storage medium, wherein the method supplies a holographic data storage medium comprising an encoded focusing hologram and one or more encoded data holograms. The method disposes the holographic data storage medium in a holographic data storage system, and disposes a rotatable imaging lens at an (i)th orientation. The method illuminates the encoded focusing hologram to generate an (i)th reconstructed focusing image, projects that (i)th reconstructed focusing image through the rotatable imaging lens, and onto at optical detector array. The method then calculates an (i)th measured focusing metric, and determines if the (i)th measured focusing metric is greater than or equal to the threshold focusing metric. If the (i)th measured focusing metric is greater than or equal to the threshold focusing metric, then the method decodes the one or more encoded data holograms.

Abstract: A method using an optical holographic data storage medium and an optical holographic data storage drive, comprising removeably disposing the optical holographic data storage medium in the optical holographic data storage drive, and determining whether to write information to the holographic data storage layer, and/or whether to read information from the holographic data storage layer, and/or whether to write information to the optical data storage layer, and/or whether to read information from the optical data storage layer. The optical holographic data storage medium comprises a holographic data storage layer and an optical data storage layer. The optical holographic data storage drive comprises a reflective spatial light modulator, a first lasing device, a first optical detector for detecting first laser light, a second lasing device, and a second optical detector for detecting second laser light.

Abstract: A method to set a rotation rate for an optical holographic data storage medium by determining if the optical storage layer comprises an alternating series of lands and grooves. If the optical storage layer does not comprise an alternating series of lands and grooves, the method rotates the optical holographic data storage medium at a rotation rate based upon a data acquisition rate for pit-recorded information. If the optical storage layer comprises an alternating series of lands and grooves and the distance between alternating grooves increases as a function of the distance from said center point, then the method rotates the optical holographic data storage medium at a constant angular velocity. If the distance between alternating grooves does not increase as a function of the distance from said center point, then the method rotates the optical holographic data storage medium at a constant linear velocity.

Abstract: A portable data storage assembly, comprising a holographic data storage layer, and an optical tracking layer comprising addressing information for the holographic data storage layer, wherein that addressing information defines a first storage band comprising a first plurality of storage addresses and a second storage band comprising a second plurality of storage addresses, wherein said second plurality of storage addresses is greater than said first plurality of storage addresses.

Abstract: A method to allocate resources in a data storage library comprising a plurality of data storage devices configured as a RAID array, by establishing a normal operation resource allocation, a RAID failure resource allocation, and a multiple storage device failure resource allocation. The method receives host I/O requests, and enqueues those host I/O requests. If the system is operating without any storage device failures, then the method processes host I/O requests using the normal operation resource allocation. If the system is operating with a storage device failure, then the method processes host I/O requests using the RAID failure resource allocation. If the system is operating with multiple storage device failures, then the method processes host I/O requests using the multiple storage device failure resource allocation.

Abstract: Provided are a method, system, and article of manufacture for providing removable storage management services using removable storage error information. Read/write error information is obtained for at least one removable storage by interfacing with the removable storage manager. The obtained read/write error information for the at least one removable storage is processed to determine read/write error rates for the at least one removable storage. A determination is made as to whether the determined read/write error rates for the at least one removable storage exceed at least one read/write error threshold. At least one message is sent to the removable storage manager to replace the at least one removable storage having read/write error rates that exceed the at least one read/write error threshold.

Abstract: Data that is to be deduplicated and compressed is received. The data is compressed then deduplicated to generate first compressed then deduplicated data. The data is deduplicated then compressed to generate first deduplicated then compressed data. The first compressed then deduplicated data is stored if the first compressed then deduplicated data is smaller in size than the first deduplicated then compressed data. The first deduplicated then compressed data is stored if the first deduplicated then compressed data is smaller in size than the first compressed then deduplicated data.

Abstract: A portable data storage cartridge comprising a housing, a first information storage medium removeably disposed within the housing, a holographic data storage medium disposed within the housing, wherein the housing is formed to include an aperture, and wherein the holographic data storage medium is disposed adjacent the aperture.

Abstract: A method for holographic information storage and retrieval is disclosed. The method supplies a holographic data storage system comprising a light source and a holographic data storage medium and provides information to the holographic data storage system. The method generates a reference beam using the light source, forms a data beam comprising a data image and an orientation image, wherein the data image comprises all or a portion of the information. The method then generates a hologram using the data beam and the write reference beam, and encodes the hologram in the holographic data storage medium to form an encoded holographic data storage medium.

Abstract: Provided are a method, system, and article of manufacture for providing removable storage management services using removable storage error information. Read/write error information is obtained for at least one removable storage by interfacing with the removable storage manager. The obtained read/write error information for the at least one removable storage is processed to determine read/write error rates for the at least one removable storage. A determination is made as to whether the determined read/write error rates for the at least one removable storage exceed at least one read/write error threshold. At least one message is sent to the removable storage manager to replace the at least one removable storage having read/write error rates that exceed the at least one read/write error threshold.

Abstract: A data storage cartridge comprises data storage media configured to store data for read and/or write access, wherein the data may be arranged in a plurality of partitions; and a plurality of cartridge memories. A control system, for example of a data storage drive, is configured to allocate at least portions of capacity of the data storage media to cartridge memories of the data storage cartridge; and to provide information defining the allocated portions of capacity to the cartridge memories. Each of the cartridge memories may have a separate user and thus provide access for that user to separate partitions.

Abstract: A method is disclosed to store and retrieve information using holographic data storage media. The method provides original data, generates a first image of that original data, and encodes that first image in a holographic data storage medium at a first storage location. The method then generates a second image of the original data, where the second image differs from the first image, and encodes the second image in a holographic data storage medium at a second storage location, where the second storage location differs from the first storage location.

Abstract: A data storage cartridge comprises data storage media configured to store data for read and/or write access, wherein the data may be arranged in a plurality of partitions; and a plurality of cartridge memories. A control system, for example of a data storage drive, is configured to allocate at least portions of capacity of the data storage media to cartridge memories of the data storage cartridge; and to provide information defining the allocated portions of capacity to the cartridge memories. Each of the cartridge memories may have a separate user and thus provide access for that user to separate partitions.

Abstract: An apparatus, system, and method are disclosed for calibrating a holographic storage device. A read channel reads a factory-stored hologram from a holographic media. A calculation module calculates a read difference between the read factory-stored hologram and a first holographic pattern that digitally describes the factory-stored hologram. In one embodiment, a calibration module calibrates the read channel with the read difference.

Abstract: A method to align the write channel portion of a holographic data storage system. The method establishes a write threshold correlation factor, provides a reference beam, and illuminates a holographic data storage medium encoded with a write reference orientation image with the reference beam to generate a write channel alignment data beam including a projected write reference orientation image. The method projects the write channel alignment data beam onto an optical detector, and calculates a first write correlation factor using the projected write reference orientation image, a stored write reference orientation image, and the tangential matched filter. If the method determines that the first write correlation factor is greater than or equal to the write threshold correlation factor, then the method determines that the spatial write channel is properly aligned.

Abstract: A method to provide data storage services using one or more holographic data storage media disposed in a holographic data storage system operated by a data storage services provider, wherein the holographic data storage system comprises a light source, a spatial light modulator, and a plurality of holographic data storage media, wherein the method receives information provided by the data storage services customer, allocates a first holographic data storage medium for exclusive storage of information provided by the data storage services customer, defines an outer storage portion of the first allocated holographic data storage medium, and stores the information as one or more holograms encoded in the outer storage portion of the first holographic data storage medium.

Abstract: A method for accessing data in a data storage system is presented. The method includes supplying a host computer that is in communication with the data storage system, where the data storage system includes a data storage medium and a holographic data storage medium. A first request is generated to access a directory encoded in the data storage medium and includes a first encryption key. The requested directory recites a listing of data files encoded in the holographic storage medium. If the first encryption key decrypts the directory, the directory is read and a data file encoded in the holographic data storage medium is identified. A second request is then generated to access the data file and includes a second encryption key. Finally, if the second encryption key decrypts the data file, then it is read.

Abstract: A data storage assembly is presented. The data storage assembly comprises a bi-layered antireflective coating. An inner layer of the antireflective coating comprises diamond like carbon. An outer layer is disposed over the inner layer.