Data storage device and servo information writing method
AssigneeHitachi Global Storage Technologies
InventorsManabu Saikawa, Hirofumi Yanase
Life of this patent
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Abstract
Provided is a data storage device in which read and write heads can be desirably located with respect to servo tracks from the viewpoint of linearity of a PES on the premise that a read write offset exists. A read write offset value, which is a deviation amount between write and read heads in a radial direction of a disk-shaped storage medium, is set equivalent to an integer number N of servo tracks.
Claims12
A data storage device comprising:
- a disk-shaped storage medium which has a data storage area and a servo area, the data storage area containing a plurality of data tracks which store user information, the servo area containing a plurality of servo tracks which store servo information for identifying positions of the plurality of data tracks;
- a hybrid head slider which supports write and read heads, the write head writing user data on the data tracks of the disk-shaped storage medium, the read head reading the user data written on the data tracks;
- and
- a rotary-type actuator which swings the hybrid head slider to position any one of the write and read heads at a target track of the disk-shaped storage medium, wherein a read write offset value is set equivalent to an integer number N of the servo tracks, the read write offset value being a deviation amount between the write and read heads in a radial direction of the disk-shaped storage medium, the deviation amount being caused by swinging of the hybrid head slider by the rotary-type actuator.
A data storage device comprising:
- a disk-shaped storage medium which has a data storage area and a servo area, the data storage area containing a plurality of data tracks which store user information, the servo area containing a plurality of servo tracks which store servo information for identifying positions of the plurality of data tracks;
- a hybrid head slider which supports write and read heads, the write head writing user data on the data tracks of the disk-shaped storage medium, the read head reading the user data written on the data tracks;
- and
- a rotary-type actuator which swings the hybrid head slider to position any one of the write and read heads at a target track of the disk-shaped storage medium, wherein a pitch of the servo tracks varies within a predetermined region in a radial direction of the disk-shaped storage medium.
A servo information writing method for writing a burst pattern as servo information on a disk-shaped storage medium of a data storage device which has a hybrid head including write and read heads, comprising the steps of:
- calculating a read write offset value within a predetermined range on the disk-shaped storage medium, the read write offset value being a deviation amount between the write and read heads in a radial direction of the disk-shaped storage medium;
- and
- writing the burst pattern so that the measured read write offset value is equivalent to an integer number N of servo tracks formed by the burst pattern.
Dependencies are inferred from the claim text.