摘要:
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.
摘要:
A verifiable security mode is provided for securing data on a storage device, such as a hard disk drive. When the verifiable security mode is enabled, only authenticated accesses to data stored on the storage device are permitted after entering a password. An end user is prevented from disabling the verifiable security mode. The verifiable security mode can be set to allow or disallow an administrator from disabling the verifiable security mode. The verifiable security mode can be implemented, for example, in firmware on a hard disk drive (HDD).
摘要:
A wireless encryption key integrated storage system is provided to prevent unauthorized access of data stored on the storage device without secure authentication between the storage device and a key device. In one embodiment, a data storage device comprises a magnetic disk; a head assembly having a read/write head which read and write data from/on the magnetic disk; a wireless transceiver configured to receive and transmit wireless signals from a key device, the wireless signals comprising information used to establish a secure authorization between the data storage device and the key device to access secured content in the magnetic disk; and a processor configured to encrypt/decrypt data transferred between the data storage device and the key device.
摘要:
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.
摘要:
Digital watermark data is embedded into compressed media content that is transmarked when the compressed media content is converted to an analog format or into an uncompressed digital format. The watermark data uniquely identifies the converter/player device/user that converted the watermark-protected digital media content into the analog format or the uncompressed digital format. The presented media content in the analog format or the uncompressed digital format is modified as a function of the watermark data and the digital signature obtained from the converter/player device/user. The modifications are visible and essentially produce a correspondingly different media presentation for each converter/player device/user. The modifications, however, are selected so that they are nonessential to the storyline and, consequently, not noticed by a casual user.
摘要:
This invention is a Viterbi algorithm combined with the use of error filters outputs to produce bit reliabilities. The present invention is a SOVA-like method using error filters to reduce the complexity of bit reliability determination further than that of the ordinary SOVA method. Error patterns corresponding to each of a handful of dominant i.e., most common error patterns are determined from experimental data. Error filters determine likelihoods of each postulated error pattern. These likelihoods are then combined to produce bit reliabilities that may be passed on to an outer error correction decoder. The filters, typically six or seven of them, resolve most of the errors thereby simplifying computation dramatically.
摘要:
A method is described for allowing disk drives, such as shingle-written magnetic recording (SMR) drives, to be shipped for customer use with portions of the magnetic media being left untested. The testing is then completed by the drive self-testing in the field. The drive is made functional at the factory by fully testing at least one operational set of regions including an I-region, an E-region and a write cache region. The operational set of regions works as a separate self-contained virtual disk drive and can be used immediately. The remaining untested areas on the media can be tested in the field by a background task and/or when the first write command is received that requires a new track or operational set of regions (on-the fly testing).
摘要:
In a HDD, the flush queue (cache) command is transformed into a memory barrier command. The HDD thus has an operation mode in which flush commands do not cause the pending commands to be executed immediately, but instead simply introduces a constraint on the command reordering algorithms that prevents commands sent after the flush command from being executed before commands sent prior to the flush command. The constraint may be applied only on write commands.
摘要:
Embodiments of the invention provide a file system that can store files or data streams in such a manner as to increase the effective storage capacity of the device on which the files or data stream are stored. In one embodiment, a system for processing and storing data comprises a first processing module configured to receive data directed to the system, the data comprising a first portion and a second portion; a second processing module configured to store the first portion of the data within a data storage device and remove the second portion of the data; a third processing module configured to retrieve the first portion of the data from the data storage device, the first portion of the data being combined with filler data to form reconstituted data; and a fourth processing module configured to send the reconstituted data to an output device.
摘要:
A method is described for allowing disk drives, such as shingle-written magnetic recording (SMR) drives, to be shipped for customer use with portions of the magnetic media being left untested. The testing is then completed by the drive self-testing in the field. The drive is made functional at the factory by fully testing at least one operational set of regions including an I-region, an E-region and a write cache region. The operational set of regions works as a separate self-contained virtual disk drive and can be used immediately. The remaining untested areas on the media can be tested in the field by a background task and/or when the first write command is received that requires a new track or operational set of regions (on-the fly testing).