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US 6,646,825 B1Granted
Data storage using disk media
AssigneeNEC Corporation
InventorsSatoru Kaneda, Hiro Karube, Yuji Kaneko, Jun Ishikawa
Life of this patent
Estimating the term…
Abstract
A first actuator for controlling positions of all of a plurality of heads within a wide area and a plurality of second actuators for individually controlling the heads within small areas are provided. When two or more of the heads are in write or read state, one or more of the heads, which are not in write or read state, is preliminarily move to a track position to be accessed next.
Claims15
A disk storage device comprising:
- three or more heads, which are coaxially rotated to read or write data from or to tracks provided on at least one recording medium;
- a first actuator for totally driving all of said heads to control positions of said heads within a large range;
- a plurality of second actuators for driving said heads individually to control positions of said heads within small ranges, respectively;
- and
- a head positioning circuit,
- said head positioning circuit comprising
- i) servo tracking means for positioning said heads to respective track positions;
- and
- ii) seek means for preliminarily moving at least one of said heads, which is not in data read or data write state, to a track position to be accessed next during a time period in which two or more of said heads are in data read or data write state.
6 more elements
A disk storage device comprising:
- three or more heads, which are coaxially rotated to read or write data from or to tracks provided on at least one recording medium;
- a first actuator for totally driving all of said heads to control positions of said heads within a large range;
- a plurality of second actuators for driving said heads individually to control positions of said heads within small ranges, respectively;
- and
- a head positioning circuit,
- said head positioning circuit comprising
- i) servo tracking means for positioning said heads to respective track positions;
- ii) seek means for preliminarily moving at least one of said heads, which is not in data read or data write state, to a track position to be accessed next during a time period in which two or more of said heads are in data read or data write state;
- and
- iii) means for starting, at substantially same time when one of said heads is set to a read or write state, seek operations of at least two remaining heads.
7 more elements
Dependencies are inferred from the claim text.