Abstract:
Holographic recording drives encode data for recording into a holographic medium. The steps comprise run length limited encoding three bytes of data into 5×5 matrix information, the data subject to a 4-byte error correction code; and providing the 5×5 matrix information to a spatial light modulator (SLM), as a portion of a two-dimensional pixel matrix of the spatial light modulator, for recording into a holographic image on the holographic medium.
Abstract:
A method, system and computer-readable medium are disclosed for efficiently multiplexing concatenated storage devices. An intelligent storage controller continuously monitors data access of a number of concatenated storage devices. In response to a request to write new data, the controller writes a primary data copy to the concatenated storage device having the lowest data access. Then the controller writes a secondary data copy to the device having the next lowest data access. In response to a read request, the controller reads data from the data copy located on the concatenated storage device having the lower data access. In response to an update request, the controller, after determining that data access does not exceed a predetermined threshold, the controller updates the data copy having the lowest data access, set that copy as the new primary copy and subsequently updates the other copy, setting that copy as the new secondary copy.
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:
An apparatus, system, and method are disclosed for injecting noise onto a link of a network. The apparatus, system, and method include, providing a noise injector card, connecting the noise injector card to the link, receiving a control signal to activate the noise injector card, switching a switch of the noise injector card, and injecting noise onto the link.
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:
An apparatus, system, and method are disclosed for formatting a timing-based servo pattern on a magnetic tape. A first write head concurrently writes a base number of stripes to a plurality of first stripe patterns with a first and third element and writes the base number of stripes to a plurality of second stripe patterns with a second and fourth element of a first write head in response to at least one first write signal. A second write head concurrently writes an incremental number of stripes to a specified first stripe pattern to form a first incremental stripe pattern with a fifth write element and writes the incremental number of stripes to a specified second stripe pattern to form a second incremental stripe pattern with a sixth write element.
Abstract:
A holographic storage drive and control of a holographic storage system are configured to write at least a group of holograms in a predetermined pattern in the holographic storage medium, and to write a directory hologram which relates to the holograms of the group to form an anchor location of the predetermined pattern. Further, a directory comprising the directory hologram stored in a memory, and the control is configured to initiate a read operation of at least one hologram of a group with an access for the directory hologram of the group at the anchor location; to read the accessed hologram, employing a matched filter to cross-correlate the read accessed hologram with an ideal version of the directory hologram derived from the directory stored in the memory; and to determine whether the read accessed hologram is the directory hologram of the group.
Abstract:
A hybrid optical and holographic data storage medium is disclosed. In addition, a method is disclosed to manage information using that optical and holographic data storage medium. The method reads information from the optical data storage layer before reading data from, or writing data to, the holographic data storage layer.
Abstract:
An apparatus, system, and method are disclosed for formatting a timing-based servo pattern on a magnetic tape. A first write head concurrently writes a base number of stripes to a plurality of first stripe patterns with a first and third element and writes the base number of stripes to a plurality of second stripe patterns with a second and fourth element of a first write head in response to at least one first write signal. A second write head concurrently writes an incremental number of stripes to a specified first stripe pattern to form a first incremental stripe pattern with a fifth write element and writes the incremental number of stripes to a specified second stripe pattern to form a second incremental stripe pattern with a sixth write element.
Abstract:
Multiple servo sensors are laterally displaced over a distance less than the transverse width of timing based servo track laterally extending transitions. The servo sensors are configured to sense the transitions, and servo detection logic detects the relative timings of the laterally extending transitions sensed by the laterally displaced servo sensors as the magnetic tape is moved in the longitudinal direction. Logic is configured to determine from the relative timings of the sensed transitions for at least one known set of laterally extending transitions having differing slants, the lateral position of a servo sensor by employing the relative timing detected from one servo sensor and the relative timing detected from another servo sensor, or determine the longitudinal velocity of the magnetic tape by determining the difference between the relative timing detected from one servo sensor and the relative timing detected from another servo sensor.