According to one embodiment, a magnetic disk device includes a disk, a head that writes data to the disk and reads data from the disk, and a controller that executes error correction on a first sector which is unreadable in a first track from an initial reading time of initially one-round reading the first track of the disk based on first parity data corresponding to the first track.

There are provided a memory system and an operating method thereof. A memory system includes: a plurality of storage regions, each including a plurality of memory cells; and a controller configured to provide a plurality of read retry sets, determine an applying order of the plurality of read retry sets based on characteristics of a read error occurred in a first storage region among the plurality of storage regions, and apply at least one of the read retry sets, based on the applying order, for a read retry operation performed on the first storage region.

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.

A method of recovering data from one or more failed data sectors includes estimating a reader offset position from a first or a second read attempt of the one or more failed data sectors at a current set of channel parameters and basing the estimated reader offset position on, at least in part, a position error signal generated during the first or second read attempt. At least one read is performed on the one or more failed data sectors at the estimated reader offset position to obtain one or more samples. The one or more samples are processed to obtain a processed sample. Iterative outer code recovery is performed on the processed sample.

The technology disclosed herein pertains to a system and method for managing write failures in a disc drive. Implementations disclosed herein provide a method including monitoring write fault events per sector for a storage device, in response to a write fault event, updating a write fault repeat count table, wherein the repeat count table tracks a number of write fault repeat counts per sector, comparing a write fault repeat count for a sector to a predetermined threshold write fault repeat count, and in response to determining that the write fault repeat count for a sector is above the predetermined threshold write fault repeat count, performing a write-reassign operation.

According to one embodiment, a magnetic disk device includes a plurality of magnetic disks, a plurality of magnetic heads provided correspondingly to the plurality of magnetic disks and configured to carry out read/write of data from/to the magnetic disks, and a control section configured to, when the magnetic head is in a second status before the magnetic head enters the first status, change setting in such a manner as to change a first memory area of a magnetic disk corresponding to the magnetic head in the second status among memory areas constituted of the plurality of magnetic disks to a second memory area in which a write count is limited.

According to one embodiment, a magnetic disk device includes a plurality of magnetic disks, a plurality of magnetic heads provided correspondingly to the plurality of magnetic disks and configured to carry out read/write of data from/to the magnetic disks, and a control section configured to, when the magnetic head is in a second status before the magnetic head enters the first status, change setting in such a manner as to change a first memory area of a magnetic disk corresponding to the magnetic head in the second status among memory areas constituted of the plurality of magnetic disks to a second memory area in which a write count is limited.

According to one embodiment, a magnetic disk device including a magnetic disk, measures an error rate of the magnetic disk, sets an area to be affected by sputtering claws generated during manufacturing of the magnetic disk based on the measured error rate, and writes reference data used for measuring the error rate to the set area. Then, the magnetic disk device manages the data written to the magnetic disk based on the error rate when reading the reference data written to the set area.

There are provided a memory system and an operating method thereof. A memory system includes: a plurality of storage regions, each including a plurality of memory cells; and a controller configured to provide a plurality of read retry sets, determine an applying order of the plurality of read retry sets based on characteristics of a read error occurred in a first storage region among the plurality of storage regions, and apply at least one of the read retry sets, based on the applying order, for a read retry operation performed on the first storage region.

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.