Magnetic disk device and write processing method
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorYusuke Tomoda
Life of this patent
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Abstract
According to one embodiment, a magnetic disk device includes a disk, a write head which is a heat assisted magnetic recording head, a write processing unit which selects shingled magnetic recording and which urges the write head to execute writing data to each of the bands, and an adjustment unit. When the write processing unit urges the write head to execute writing the data to the first band, the adjustment unit arranges one or more unused sectors among the plurality of unused sectors, in the tracks other than a last track where the data is last written. The plurality of data sectors of the first band include a plurality of recording sectors, and a plurality of unused sectors.
Claims20
A magnetic disk device comprising:
- a disk having a plurality of bands each including a plurality of tracks in a recording layer, the plurality of bands including a first band, each of the tracks including a plurality of data sectors;
- a write head writing data to the recording layer, the write head being a heat assisted magnetic recording head;
- a write processing unit which selects shingled magnetic recording of overwriting data to the plurality of tracks in an overwrite direction parallel to a radial direction of the disk and which urges the write head to execute writing data to each of the bands;
- and
- an adjustment unit,
- wherein
- when the write processing unit urges the write head to execute writing the data to the first band,
- the adjustment unit arranges one or more unused sectors among a plurality of unused sectors, in the tracks other than a last track where the data is last written, and
- the plurality of data sectors of the first band include a plurality of recording sectors where valid data is written, and the plurality of unused sectors that are data sectors other than the plurality of recording sectors and where the valid data is not written.
A write processing method applied to a magnetic disk device comprising a disk having a plurality of bands each including a plurality of tracks in a recording layer, the plurality of bands including a first band, each of the tracks including a plurality of data sectors, a write head writing data to the recording layer, the write head being a heat assisted magnetic recording head, a write processing unit which selects shingled magnetic recording of overwriting data to the plurality of tracks in an overwrite direction parallel to a radial direction of the disk and which urges the write head to execute writing data to each of the bands, and an adjustment unit, the method comprising:
- when the write processing unit urges the write head to execute writing the data to the first band, arranging one or more unused sectors among a plurality of unused sectors, in the tracks other than a last track where the data is last written,
- wherein
- the plurality of data sectors of the first band include a plurality of recording sectors where valid data is written, and the plurality of unused sectors that are data sectors other than the plurality of recording sectors and where the valid data is not written.
Dependencies are inferred from the claim text.