10 results about "Shingled magnetic recording" patented technology

Controlling a shingled magnetic recording (SMR) hard drive involves attempting a sequential write to a first sector of a sequence of sectors and, responsive to encountering a write inhibit boundary corresponding to the first sector, continuing the write to the next available sector in the sequence of sectors for the write. Thus, instead of that write inhibit triggering a hard error, the data is adaptively written to the next down-track physical sector possible, i.e., “sliding” to the next sector. This does not require an additional disk revolution thus there is negligible performance penalty. The write may be continued to the next track if necessary, and may continue through the entire zone, to maintain all the data in sequential form for performance and large block protection purposes.

The present technology enhances workload management of data storage systems by using an internal copy function and / or a zone-append technology. The internal copy function is used, e.g., in merge operations to move data between locations on a disk without using off-disk resources (e.g., processing or memory of a CPU). Zone-append technology uses nameless writes (e.g., write instruction without an assigned destination address on the disk) to combine IO units from different threads to be written to a common zone of a disk (e.g., a shingled magnetic recording (SMR) disk). Sequential addresses are assigned to IO units from different threads based on their order in the write queue, reducing the latency and seek time typically associated with random writes. The zone-append technology, e.g., uses sequential write operations within specified zones, allowing the disk to determine the actual write location and to report post-write logical block addresses (LBAs).

Write commands in a shingled magnetic recording (SMR) drive are efficiently executed when a write command and associated write data are received by an SMR HDD from a host while the target SMR band for storing the write data is undergoing a refresh operation. In response to the write command, the HDD suspends the refresh operation, stores the write data in nonvolatile memory, and informs the host that the write command has been completed. After the write data are stored in nonvolatile memory, the HDD resumes the refresh operation, and the remaining unrefreshed data in the target SMR band are refreshed by being rewritten to the spare SMR band. The nonvolatile memory can include the spare SMR band in some instances, the target SMR band in some instances, and in both the spare SMR band and the target SMR band in some instances.

According to one embodiment, a magnetic disk device includes a disk, a write head, an adjustment unit, and a write processing unit. The adjustment unit adjusts each of a first adjustment value, a second adjustment value, and a third adjustment value. The write processing unit can select shingled magnetic recording and perform write processing based on the first to third adjustment values. When the number of the plurality of tracks of the band is t+1 and the number of unused sectors among the plurality of sectors of the band is e. The adjustment unit adjusts the first to third adjustment values to establish e<t.

An information processing apparatus includes a nonvolatile memory and circuitry. The nonvolatile memory stores data written using shingled magnetic recording, in which tracks are partially arranged one over another in a radial direction. The circuitry is to instruct the nonvolatile memory to write the data in units of sectors, additionally write the data to a data writing area of the nonvolatile memory, create, on a volatile memory, a buffer for delayed writing in which the data to be written to the data writing area is temporarily held, and write the data in the buffer for delayed writing to the nonvolatile memory in a case that a total amount of data accumulated in the buffer for delayed writing exceeds a threshold value.

The present technology enhances workload management of data storage systems by using an internal copy function and / or a zone-append technology. The internal copy function is used, e.g., in merge operations to move data between locations on a disk without using off-disk resources (e.g., processing or memory of a CPU). Zone-append technology uses nameless writes (e.g., write instruction without an assigned destination address on the disk) to combine IO units from different threads to be written to a common zone of a disk (e.g., a shingled magnetic recording (SMR) disk). Sequential addresses are assigned to IO units from different threads based on their order in the write queue, reducing the latency and seek time typically associated with random writes. The zone-append technology, e.g., uses sequential write operations within specified zones, allowing the disk to determine the actual write location and to report post-write logical block addresses (LBAs).

Systems and methods for data storage in a storage device are provided in the present disclosure. The method may include dividing the storage device into a recording region and a shingled magnetic recording (SMR) region. The SMR region may be configured to store data, and the recording region may be configured to store storage information associated with the storage device. The storage information may include at least a corresponding relationship between an index of the data and a storage location of the data. The method may also include obtaining target data to be stored. The method may further include determining, based on the target data and the storage information, a target position in the SMR region for storing the target data.

According to one embodiment, an adjustment method of a heat-assisted magnetic recording and reproduction device including a magnetic recording head and a heat-assisted magnetic recording medium, in which write characteristics are improved in a start area of a shingled magnetic recording band and in each area storing information other than user data.

Embodiments of the present application disclose a hard disk testing method and device, electronic equipment and medium. The method comprises: creating a disk array for a shingled magnetic recording (SMR) area and a conventional magnetic recording (CMR) area in a shingled hard disk; issuing data blocks to the disk array and / or reading data blocks; wherein the way of issuing data blocks to the disk array corresponding to the SMR area does not include a random way; and performing performance testing on the disk array issuing data blocks and / or reading data blocks. The technical solution can adaptively create a disk array for different areas of a shingled hard disk, and then perform testing respectively, thereby improving the accuracy and stability of shingled hard disk performance testing through a scheme suitable for shingled hard disk testing.

Write commands in a shingled magnetic recording (SMR) drive are efficiently executed when a write command and associated write data are received by an SMR HDD from a host while the target SMR band for storing the write data is undergoing a refresh operation. In response to the write command, the HDD suspends the refresh operation, stores the write data in nonvolatile memory, and informs the host that the write command has been completed. After the write data are stored in nonvolatile memory, the HDD resumes the refresh operation, and the remaining unrefreshed data in the target SMR band are refreshed by being rewritten to the spare SMR band. The nonvolatile memory can include the spare SMR band in some instances, the target SMR band in some instances, and in both the spare SMR band and the target SMR band in some instances.