A setting unit is configured to set first write processing for writing second data in a hard disk, or second write processing for writing the second data in the hard disk and reading data that is written by writing of the second data, and a change unit is configured to change the write processing set in the setting unit. The change unit changes the write processing set in the setting unit from the first write processing to the second write processing, based on determination that the first data is greater than or equal to a threshold by a determination unit.

A wear mitigation system can be implemented in a data storage device. A data storage medium may be separated from a transducing head by an air bearing. A controller connected to the data storage medium and transducing head can be configured to reassign a physical address of the data storage medium from an unusable condition to a usable condition as a result of a self-healing of the data storage medium predicted by the controller.

One embodiment facilitates a write operation in a shingled magnetic recording device. During operation, the system receives, by the storage device, data to be written to the storage device and access-frequency information associated with the data, wherein the storage device includes a plurality of concentric tracks. The system distributes a plurality of spare sector pools among the plurality of concentric tracks. The system selects a track onto which to write the data based on the access-frequency information, wherein data with a highest access-frequency is written to an outer track. The system appends the data at a current write pointer location of the selected track, thereby facilitating an enhanced data placement for subsequent access in the storage device.

According to one embodiment, a magnetic disk device includes a disk that includes a plurality of tracks, each track including a plurality of sectors for storing data, a head that is for writing data to the plurality of sectors and reading data from the plurality of sectors, and a controller. The controller is configured to determine that a first sector of the plurality of sectors is not able to be read and is a defective sector, determine that a second sector of the plurality of sectors is disposed along a line that extends through the first sector and a defective sector included in a first list of defective sectors, register the second sector in the first list of defective sectors, and reallocate an address corresponding to the second sector to a first alternative sector included on the disk.

Example read channel circuits, data storage devices, and methods to provide overlapping processing of data tracks are described. The data storage device may include media configured with a plurality of tracks in a concentric or continuous pattern. The read signal for a data track may be processed using error correction codes (ECC) as it is read during a first track read operation period. Some portion of its data sectors may need additional ECC postprocessing after the first track is initially received and processed by the read channel circuit. While the read signal for a next data track is being read and processed, the read channel circuit may continue postprocessing of the portion of data sectors from the first track during the second track read operations. Various decision parameters for managing the data stream, additional postprocessing time, and rereading tracks for data recovery are also described.

According to one embodiment, a magnetic disk device comprises magnetic disks, heads, and a controller. The controller does not allocate logical addresses to sectors of a first area to be specified in such a manner as to correspond to a defect existing in a predetermined recording area, the first area being within the predetermined recording area constituted of a plurality of cylinders adjacent to each other in the magnetic disks, and uniquely allocates logical addresses to sectors of a second area other than the first area. The controller makes allocation of logical addresses to the sectors of the second area different from each other according to the number of defects existing in the predetermined recording area.

Embodiments of the present disclosure relate to a method, an electronic device, and a computer program product for failure handling. This failure handling method includes determining a sector set failure type associated with at least one failed sector set of a disk; if the sector set failure type indicates that the number of failed sector sets in the at least one failed sector set is greater than a first threshold number, generating an instruction for replacing the disk; and otherwise performing at least one of the following: migrating data from a failed sector set in which the number of failed sectors is greater than a second threshold number to a spare sector set, and performing a failure recovery for a failed sector set in which the number of failed sectors is less than or equal to the second threshold number.

A storage system such as a hard disc drive (HDD), solid-state drive (SSD), hybrid drive (SSHD), storage rack, set of storage racks, JBOD, array of discs, etc. may include a variety of storage media. Failures may be detected in the storage media of the storage system. Such a failure may affect the physical capacity of the storage system. A storage controller of the storage system initiates a media conversion that converts a portion of the storage media from media storing data according to a first recording scheme to a media storing data according to a second recording scheme. The second recording scheme stores data at a higher density compared to the first recording scheme.

The present disclosure discloses a method, apparatus for processing a disk bad sector, and a computer storage medium. The method includes: obtaining a target disk that is to be processed, and detecting bad sector data in the target disk; combining bad sector areas represented by the bad sector data, to obtain a usable area different from the bad sector areas in the target disk; and determining, according to a detection result, whether the target disk is usable, reconstructing storage space of the target disk based on the usable area if the target disk is usable, and setting an access parameter for the reconstructed storage space. The technical solutions provided by the present disclosure can improve processing efficiency of a faulty disk while saving a disk resource.

According to one embodiment, a defect registration method includes measuring, performing first extracting, and registering. The measuring is measuring, on a unit-area basis, performance of a storage area of a magnetic disk including a plurality of unit areas. The storage area includes a redundant area of a set capacity. The first extracting includes second extracting one or more unit areas in order of increasing the performance. The registering is registering the extracted unit areas of the set capacity as defect locations.