Kabushiki Kaisha Toshiba

Toshiba Electronic Devices & Storage Corporation

Ryuta Kumagai

Takahiro Shinbori

Shoichi Aoki

Takao Aoki

According to one embodiment, a magnetic disk device configured to record data in a shingled-recording manner, wherein the device performs sequential write in a shingled-recording area on a magnetic disk such that data to be written in a write target track and data located in a one-forward track of the write target track are received on a volatile memory and then write with respect to the write target track is performed, and upon occurrence of an unexpected power cut, the device stores data unwritten in the shingled-recording area out of the data received on the volatile memory in a nonvolatile memory.

Magnetic disk device and write method

According to one embodiment, a magnetic disk device includes heads and a controller. The heads write data in a recording region of the magnetic disk. The controller divides in order, by a track group with a constant size, an entire region of the recording region where management regions indicating physical positions corresponding to the heads, respectively, creates the track groups so as to straddle the management regions at boundaries of the management regions, and controls writing of the data for each of the track groups. The controller assigns unique and logically consecutive numbers to the track groups and manages information on the management regions to which the track groups belong.

Magnetic disk device and recording method of the same

An information recording device includes a recording medium with a plurality of data tracks and a controller that stores management information regarding data recorded in a group of adjacent data tracks, the recorded data including first data recorded in a first data track that is partially overwritten by second data subsequently recorded in a second data track that is adjacent to the first data track. The controller recovers management data of the recorded data based on whether or not a sector in the first data track that is adjacent to a sector in the second data track can be read by offset read processing when the sector in the second data track cannot be read by normal read processing.

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Yokohama Kanagawa, Japan

Ryuta Kumagai