Abstract: A memory system having a plurality of memory components and a controller, operatively coupled to the plurality of memory components to: store data in the memory components; communicate with a host system via a bus; service the data to the host system via communications over the bus; communicate with a processing device that is separate from the host system using a message passing interface over the bus; and provide data access to the processing device through communications made using the message passing interface over the bus.

Abstract: A computing system having memory components of different tiers. The computing system further includes a processing device, operatively coupled to the memory components, to: receive data access requests; generate a plurality of data access streams in accordance with the data access requests and access characteristics of the request; match characteristics of the data access streams with characteristics of the different tiers of the memory components; and direct the plurality of data access streams to the different tiers of the memory components based on matching the characteristics of the data access streams with the characteristics of the different tiers of the memory components.

Abstract: In an example, a method for secure publication of content is described. The method may include encrypting content with a media key. The method may also include providing the encrypted content to a client device associated with a private key and a public key. The private key may be stored at the client device. The method may also include encrypting the media key with the public key. The method may also include providing the encrypted media key to the client device.

Abstract: In an example, a method of securing content is described. The method may include instantiating a content server on a client device. The method may also include operating the content server to retrieve content identified by a Uniform Resource Identifier (URI). The method may also include serving the content from the content server to a content renderer on the client device. The content renderer may be configured to render the content at the client device and to prohibit saving the content in the clear on the client device.

Abstract: In an example, a method of securing content is described. The method may include instantiating a content server on a client device. The method may also include operating the content server to retrieve content identified by a Uniform Resource Identifier (URI). The method may also include serving the content from the content server to a content renderer on the client device. The content renderer may be configured to render the content at the client device and to prohibit saving the content in the clear on the client device.

Abstract: In an example, a method for secure publication of content is described. The method may include encrypting content with a media key. The method may also include providing the encrypted content to a client device associated with a private key and a public key. The private key may be stored at the client device. The method may also include encrypting the media key with the public key. The method may also include providing the encrypted media key to the client device.

Abstract: In an example, a method of securing content is described. The method may include instantiating a content server on a client device. The method may also include operating the content server to retrieve content identified by a Uniform Resource Identifier (URI). The method may also include serving the content from the content server to a content renderer on the client device. The content renderer may be configured to render the content at the client device and to prohibit saving the content in the clear on the client device.

Abstract: In an embodiment, a method for making copies of a master disc is described. The method includes receiving a master disc. The method also includes capturing an image of a label on a first side of the master disc. The method also includes generating a data image of data stored on the master disc. The method also includes making one or more copies of the master disc using one or more blank discs. Making the one or more copies includes recording the data image onto a data side of each of the one or more blank discs and printing the image of the label on an opposing side of each of the one or more blank discs.

Abstract: Compensation for repeated runout (RRO) error, such as in a data storage device servo circuit, is preferably carried out by obtaining a population distribution of RRO error values from at least selected ones of a subset of tracks. An RRO error compensation value is determined for each one of the subset of tracks when a variance characteristic of said population distribution meets a selected criterion. Preferably, a first track of a storage medium has a servo field at a first angular position on the medium, a repeated runout (RRO) error compensation field at a second angular position on the medium, and a user data field at a third angular position on the medium. An immediately adjacent second track preferably has a servo field at the first angular position and a user data field at the second angular position in lieu of an RRO error compensation field.

Abstract: Compensation for repeated runout (RRO) error, such as in a data storage device servo circuit, is preferably carried out by obtaining a population distribution of RRO error values from at least selected ones of a subset of tracks. An RRO error compensation value is determined for each one of the subset of tracks when a variance characteristic of said population distribution meets a selected criterion. Preferably, a first track of a storage medium has a servo field at a first angular position on the medium, a repeated runout (RRO) error compensation field at a second angular position on the medium, and a user data field at a third angular position on the medium. An immediately adjacent second track preferably has a servo field at the first angular position and a user data field at the second angular position in lieu of an RRO error compensation field.

Abstract: A method and apparatus for reducing the effects of non-repeatable runout (NRRO) in the estimation of repeatable runout (RRO) in a disc drive is disclosed. PES information is a acquired in a way that leads to randomization of the phase of the NRRO, thereby decreasing the number of revolutions required to estimate the true RRO. A number of RRO estimation measurements are taken over a number of non-consecutive disc revolutions that are spaced in time. In one embodiment, one revolution of RRO data is collected from each head before collecting a second revolution of RRO data from any of the heads. In another embodiment, RRO estimation is concurrent with media certification, such that PES data is obtained while the head is in the write position and writes a track of data for media certification. Similarly, PES data for the read position is obtained while concurrently reading back the written data.

Abstract: An equalization filter for counteracting the effects of unwanted resonance modes and noise in the VCM plant. The filter comprises a transfer function derived from a function of the actual VCM plant response and an ideal response, for which the servo controller is designed. The response of the combined equalization filter and the actual VCM plant response substantially adheres to the ideal response. The disc drive includes firmware operable to generate one or more equalization filters for each of one or more heads.

Abstract: A method and apparatus for reducing the effects of non-repeatable runout (NRRO) in the estimation of repeatable runout (RRO) in a disc drive is disclosed. PES information is a acquired in a way that leads to randomization of the phase of the NRRO, thereby decreasing the number of revolutions required to estimate the true RRO. A number of RRO estimation measurements are taken over a number of non-consecutive disc revolutions that are spaced in time. In one embodiment, one revolution of RRO data is collected from each head before collecting a second revolution of RRO data from any of the heads. In another embodiment, RRO estimation is concurrent with media certification, such that PES data is obtained while the head is in the write position and writes a track of data for media certification. Similarly, PES data for the read position is obtained while concurrently reading back the written data.

Abstract: An equalization filter for counteracting the effects of unwanted resonance modes and noise in the VCM plant. The filter comprises a transfer function derived from a function of the actual VCM plant response and an ideal response, for which the servo controller is designed. The response of the combined equalization filter and the actual VCM plant response substantially adheres to the ideal response. The disc drive includes firmware operable to generate one or more equalization filters for each of one or more heads.

Abstract: A method and apparatus are provided for positioning a head over a disc in a disc drive while maintaining servo loop stability. The apparatus includes an actuator-head assembly having a large scale actuator and a micro-actuator that are both able to move the head over the disc. An anti-windup compensation component detects when a micro-actuator controller is producing a micro-actuator control value that will saturate the micro-actuator. Using the micro-actuator control value, the anti-windup compensation component generates a saturation tracking error signal. A summing component then combines a position value that the head generates based on its position over the disc with the saturation tracking error signal to form a position error value that masks the saturation of the micro-actuator.