Magnetic disk apparatus and data refresh method

Patent metadata

Field	Value
Publication number	US-9007708-B2
Application number	US-201213563486-A
Country	US
Kind code	B2
Filing date	Jul 31, 2012
Priority date	Jan 27, 2012
Publication date	Apr 14, 2015
Grant date	Apr 14, 2015

Abstract

According to at least one embodiment, a magnetic disk apparatus includes a disk, a random number generator, a determination module, and a refresh module. The disk includes a plurality of tracks. A random number generator generates a random number within a range of N integers in accordance with writing to a first area of a first track of the plurality of tracks. A determination module determines whether the generated random number includes a predetermined number. A refresh module refreshes a second area of a second track near the first track based on a result of determination of the determination module. The second area corresponds to the first area.

First claim

What is claimed is:

1. A magnetic disk apparatus comprising:
a disk;
a random number generator to generate random numbers selected from one to N, each of the random numbers being generated with an occurrence probability of 1/N when data is written to a part of a first track of the disk, N being a positive integer greater than one;
a memory to store a normalized write count associated with the part of the first track, the normalized write count being a write count normalized by…

Assignees

• Inoue Hiroaki
• Toshiba Kk

Inventors

• Inoue Hiroaki

Classifications

• G11B20/10009

  Physics · mapped topic

• G11B5/09

  Physics · mapped topic

• G11B5/012

  Physics · mapped topic

• G11B20/1879 Primary

  Physics · mapped topic