Patent ID: 7719789
Filing Date: 2010-05-18
Classification: G11B

Abstract:
1. A controlling device for a storage device, the controlling device comprising: a rotation-drive controlling unit that drives a magnetic storage medium for rotation, the magnetic storage medium including tracks and guard bands magnetically separating adjacent tracks alternately and concentrically disposed, the tracks including a plurality of data tracks in which data can be written and from which data can be reproduced and servo patterns disposed between the data tracks and allowing reproduction of positional information of the data tracks, the magnetic storage medium including an offset-amount measurement area in which traverse tracks are formed so as to traverse adjacent tracks via each of the guard bands so that writing regarding offset measurement data for measuring an offset amount between a storage element and a reproducing element of a magnetic head unit is allowed at a center position of the storage element; a magnetic-head-drive controlling unit that controls a movement of the magnetic head unit in a track direction with respect to the magnetic storage medium; a write controlling unit that writes, when an offset-amount measurement start signal is detected, the offset measurement data in a part of a relevant one of the traverse tracks in the offset-amount measurement area through the storage element, and also stores a write position of the storage element in the track direction; a reproduction controlling unit that sequentially positions, when the offset measurement data is written in the part of the traverse track in the offset-amount measurement area, a center position of the reproducing element of the magnetic head unit at a reproduction position in a reproducible range regarding the write position through the magnetic-head-drive controlling unit for each predetermined distance to produce a reproduction output; and an offset-amount determining unit that specifies, from among peak values of the reproduction output for each reproduction position, a reproduction position corresponding to a maximum peak value as a reproduction position of the reproducing element and, based on the write position of the storage element and the reproduction position of the reproducing element, determines an offset amount as a moved distance between the storage element and the reproducing element.