Abstract: Deduplication and compression evaluation methods and systems involve one or more processors obfuscating plain text file data in each file of a computer file system using a first cipher encryption scheme, obfuscating each plain text file name representing the plain text file data in each file of the computer file system using a second cipher encryption scheme, and associating each obfuscated file name representing the plain text file data of each of the plurality of files of the computer file system with the obfuscated file data of each of the plurality of files of the computer system. In addition, each plain text directory name for each of the obfuscated file names associated with the obfuscated file data in each of the plurality of files of the computer file system is obfuscated using a third cipher encryption scheme.

Abstract: Deduplication and compression evaluation methods and systems involve one or more processors obfuscating plain text file data in each file of a computer file system using a first cipher encryption scheme, obfuscating each plain text file name representing the plain text file data in each file of the computer file system using a second cipher encryption scheme, and associating each obfuscated file name representing the plain text file data of each of the plurality of files of the computer file system with the obfuscated file data of each of the plurality of files of the computer system. In addition, each plain text directory name for each of the obfuscated file names associated with the obfuscated file data in each of the plurality of files of the computer file system is obfuscated using a third cipher encryption scheme.

Abstract: Deduplication and compression evaluation methods and systems involve one or more processors generating a hash value for each block of data in a block storage device and creating a random substitution cypher using the respective hash values for each of said blocks of data as seed values to a random number generator. Thereafter, positions of run lengths for each of said blocks of data are randomly shuffled by the one or more processors with no run lengths having identical run length values disposed adjacent one another, a synthetic version of each of said blocks of data is generated using the substituted, shuffled, run lengths.

Abstract: Approaches for a digital storage device that moves or transforms data between various storage locations based on anticipated use. A digital storage device comprises one or more processors and one or more storage mediums for storing digital data. The digital storage device comprises a software agent. The agent maintains a local index to a set of data sets stored on the storage mediums. The indexed files are associated with an identifier, which may identity any unique entity. The software agent sends the local index over a network to an index manager. The agent receives, from the index manager, a remote index that identifies storage locations for other data sets associated with the identifier. The agent may use the local and remote index to move data sets between storage locations and/or transform data sets based on which device they will be accessed.

Abstract: In one embodiment, a request to deliver a piece of digital content to a recipient is received. In response to the request, a datum is embedded in an equivalent piece of digital content that identifies the recipient. The equivalent piece of digital content is then delivered to the recipient.

Abstract: A system for enhancing command scheduling is provided. In particular embodiments, the system includes a processor and a scheduler that receives commands from the processor for accessing a storage device. The scheduler receives a set of commands, some of which have a deadline, and the scheduler is configured to determine an execution order for those commands. The scheduler is also configured to defer the execution of one or more of those commands to a later time.

Abstract: Approaches for a digital storage device that moves or transforms data between various storage locations based on anticipated use. A digital storage device comprises one or more processors and one or more storage mediums for storing digital data. The digital storage device comprises a software agent. The agent maintains a local index to a set of data sets stored on the storage mediums. The indexed files are associated with an identifier, which may identity any unique entity. The software agent sends the local index over a network to an index manager. The agent receives, from the index manager, a remote index that identifies storage locations for other data sets associated with the identifier. The agent may use the local and remote index to move data sets between storage locations and/or transform data sets based on which device they will be accessed.

Abstract: A data storage device accepts queued read and write commands that have deadlines. The queued read and write commands are requests to access the data storage device. The deadlines of the queued read and write commands can be advisory deadlines or mandatory deadlines.

Abstract: A system includes a storage device and a scheduler. The scheduler determines if deadlines of requests for accessing the storage device fall within first and second sliding windows. The scheduler issues requests that are in the first sliding window in a first order of execution and requests that are in the second sliding window in a second order of execution.

Abstract: A disk drive apparatus includes at least one disk, a head-arm assembly, and a controller circuit. The head arm assembly includes at least one read/write head. The head-arm assembly is movable to enable the read/write head to access a writable surface of the disk. The controller circuit also causes the read/write head to record data on the writable surface of the disk in a write append format.

Abstract: Techniques for optimizing hard disk drive performance. According to one embodiment, a storage system includes a storage unit that stores data and a controller. The controller receives an idle mode indication and performs at least one operation based on the idle mode indication. According to another embodiment, a host system includes a processor and a scheduler that is operative to issues commands. The processor computes the idle mode indication, and the processor sends the idle mode indication to the storage system.

Abstract: The invention is a storage device which implements a write barrier command and provides means for a host to designate other write commands as being sensitive or insensitive to the existence of write barrier commands. The device can optimize the execution of commands by changing the order of execution of write commands that are insensitive to write barrier command. In an embodiment of the invention a flag associated with the write command indicates whether the command is sensitive or insensitive to the existence of write barrier commands. In an embodiment of the invention the write barrier command can be implemented as a write command with a flag that indicates whether the command is a write barrier command. In one embodiment of the invention the queue of commands and data to be written to the media is stored in a non-volatile cache.

Abstract: Content is stored as ClearText by a content provider within a trusted area. Specific content is requested by an end user, preferably via a service provider, and the requested content is encrypted and then delivered over a secure communications channel to a home server system. While the encrypted content is stored on the home server system, the associated encryption keys are stored as a license with the content provider. When a playback device on the home server system is instructed to play back the encrypted content, the encrypted content is streamed from local storage within the home server system while the associated encrypted keys are simultaneously streamed from the content provider to the playback device.

Abstract: Enhancements to the functionality of a file system are provided. A file system can provide an additional level of error correction, in addition to the error correction provided by a data storage device. An extension to the metadata area in a file system can store index information about data files that the file system can use to reduce the time it takes to access the files. A file system can use extended metadata to store conditional access information for data files stored in the file system. A data storage device can also examine and characterize the data being stored in order to categorize a user's files automatically. Modules can be loaded into a file system to provide new functionality to the file system. The modules can load additional modules to extend their functionality.

Abstract: Content is stored as ClearText by a content provider within a trusted area. Specific content is requested by an end user, preferably via a service provider, and the requested content is encrypted and then delivered over a secure communications channel to a home server system. While the encrypted content is stored on the home server system, the associated encryption keys are stored as a license with the content provider. When a playback device on the home server system is instructed to play back the encrypted content, the encrypted content is streamed from local storage within the home server system while the associated encrypted keys are simultaneously streamed from the content provider to the playback device.

Abstract: A disk drive apparatus includes at least one disk, a head-arm assembly, and a controller circuit. The head arm assembly includes at least one read/write head. The head-arm assembly is movable to enable the read/write head to access a writable surface of the disk. The controller circuit also causes the read/write head to record data on the writable surface of the disk in a write append format.

Abstract: A data storage device accepts queued read and write commands that have deadlines. The queued read and write commands are requests to access the data storage device. The deadlines of the queued read and write commands can be advisory deadlines or mandatory deadlines.

Abstract: A system includes a storage device and a scheduler. The scheduler determines if deadlines of requests for accessing the storage device fall within first and second sliding windows. The scheduler issues requests that are in the first sliding window in a first order of execution and requests that are in the second sliding window in a second order of execution.

Abstract: A system for enhancing the reliability of file systems is provided. In particular embodiments, the system includes a data storage device that includes one or more journal blocks, one or more primary metadata blocks, and one or more mirror metadata blocks. The system also includes a file system that writes metadata to the one or more journal blocks before writing the metadata to both the one or more primary metadata blocks and to the one or more mirror metadata blocks.

Abstract: The invention is a storage device which implements a write barrier command and provides means for a host to designate other write commands as being sensitive or insensitive to the existence of write barrier commands. The device can optimize the execution of commands by changing the order of execution of write commands that are insensitive to write barrier command. In an embodiment of the invention a flag associated with the write command indicates whether the command is sensitive or insensitive to the existence of write barrier commands. In an embodiment of the invention the write barrier command can be implemented as a write command with a flag that indicates whether the command is a write barrier command. In one embodiment of the invention the queue of commands and data to be written to the media is stored in a non-volatile cache.