摘要:
A drive is disclosed comprising a head actuated over a disk comprising a plurality of data tracks. A random access write zone is defined on the disk comprising a first plurality of the data tracks, and a circular buffer write zone is defined on the disk comprising a second plurality of the data tracks. Write commands are received comprising logical block addresses (LBAs). First frequency and second frequency write LBAs are identified, where the second frequency is higher than the first frequency. Data associated with the first frequently write LBAs is stored in the circular buffer write zone, and data associated with the second frequency write LBAs is stored in the random access write zone.
摘要:
A disk drive is disclosed that utilizes sorted serpentine mapping of data tracks. In one embodiment, a plurality of physical heads of the disk drive is mapped to a plurality of logical heads. The plurality of logical heads is sorted according to the respective data rates of the physical heads, such as in the order of decreasing data rates. Data tracks are mapped using sorted serpentine mapping that utilizes the sorted order of the logical heads. Improved performance can thereby be attained.
摘要:
A disk drive is disclosed comprising a plurality of disk surfaces, and a head actuated over each disk surface. When a write command is received, the data is written to a selected disk surface in response to a measured environmental condition. For example, the heads may exhibit different write performance based on the ambient temperature, and therefore the head to write data may be selected based on a measured ambient temperature at the time of the write operation.
摘要:
A hybrid drive is disclosed comprising a disk channel including a head actuated over a disk, the disk comprising a plurality of data sectors, and a non-volatile semiconductor memory (NVSM) comprising a plurality of memory segments. Write commands are received from a host, wherein the write commands comprise write data. When a frequency of the write data exceeds a threshold, an operating mode of the disk channel is changed to change a power consumption rate of the disk channel.
摘要:
A hybrid drive is disclosed comprising a head actuated over a disk comprising a plurality of data sectors, and a non-volatile semiconductor memory (NVSM). A read frequency of a first logical block address (LBA) is maintained, and when the read frequency of the first LBA exceeds a threshold and a corresponding PBA is assigned to a data sector of the disk, first data stored in the data sector is copied to a memory segment of the NVSM. When the read frequency of the first LBA exceeds a threshold and the PBA is assigned to a memory segment of the NVSM, first data stored in the memory segment is copied to a data sector of the disk. When a read command is received to read the first LBA, a decision is made to read the first data from one of the NVSM and the disk.
摘要:
A hybrid drive is disclosed comprising a non-volatile semiconductor memory (NVSM) comprising a plurality of blocks, and a head actuated over a disk comprising a plurality of tracks, each track comprising a plurality of data sectors. A garbage collection operation is executed on the NVSM by reading valid data from a first block of the NVSM, writing the valid data to the disk, and erasing the first block.
摘要:
A disk drive is disclosed comprising a disk having a plurality of data sectors, and a head actuated over the disk. The disk drive further comprises control circuitry operable to execute a write operation for writing data to the disk. A first part of the data is written to a first data sector together with a first sector signature data (SSD) record comprising a first parameter of the write operation and a first id that identifies the first parameter. A second part of the data is written to a second data sector together with a second SSD record comprising a second parameter of the write operation and a second id that identifies the second parameter.
摘要:
A disk drive is disclosed comprising a disk and a head actuated over the disk. The disk comprises a plurality of tracks, wherein each track comprises a plurality of data sectors. A read command is received from a host to read data from a target data sector. When it is determined that the target data sector has not been written by the host, dummy data is returned to the host.
摘要:
A disk drive is disclosed including a disk having a plurality of tracks, and a head actuated over the disk. A write frequency of write data received from a host is monitored. When the write frequency falls below a threshold, the disk drive is configured to operate in a low frequency access mode when accessing the disk, wherein a parameter of the disk drive is configured to increase the reliability of the disk drive. When the write frequency rises above a threshold, the disk drive is configured to operate in a high frequency access mode when accessing the disk, wherein the parameter of the disk drive is configured to increase the performance of the disk drive.
摘要:
The present invention may be regarded as a digital video recorder (DVR) comprising a storage device for storing an encrypted video program, a unique ID for interlocking the encrypted video program with the digital video recorder, and a cryptography facility. The cryptography facility comprises an encoder, responsive to the unique ID, for encrypting a plaintext video program into the encrypted video program stored on the storage device, and a decoder, responsive to the unique ID, for decrypting the encrypted video program stored on the storage device into the plaintext video program during playback.