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AssigneeSeagate Technology LLC
InventorsXiong Liu, Joseph Cheng-Tsu Liu, Kevin A. Gomez, Choonkiat Lim
Estimating the term…
An HDA includes a base, a disc stack coupled to a spindle rotatably attached to the base by a spindle shaft and spindle bearing. An actuator assembly is pivotally attached to the base at a pivot shaft. Attached to one end of the actuator assembly proximal the disc stack is one or more transducers for reading/writing information from/to the discs. A servo writer includes a controller for moving the actuator during the servo writing process. The controller moves the servo writer at the cage frequency of the spindle bearing to lessen the relative motion between the transducer head and the disc as the servo information is written to the disc. The controller also may be programmed to move the transducer at both the spindle rotation frequency and the cage frequency of the spindle bearing to lessen the relative motion between the transducer and the disc during the servo writing process.
A servo track writer for writing servo information to a head disc assembly, the head disc assembly including a disc attached to a base with a spindle bearing, and a rotary actuator adjacent the disc, the actuator including a read/write head for selectively magnetizing the disc, the servo track writer comprising:
A method for writing servo patterns to a disc drive which includes at least one disc mounted on a spindle with a spindle bearing, the at least one disc mounted for rotation about an axis, the disc drive also including an actuator for moving each of at least one transducer relative to an associated at least one disc, the at least one transducer for reading and writing information to the associated disc, the servo writer including a linkage for controllably moving the actuator during servo writing, said method comprising steps of:
A servo track writer for writing servo information to a head disc assembly, the head disc assembly including a disc attached to a base with a spindle bearing, and a rotary actuator adjacent the disc, the actuator including a read/write head for selectively magnetizing the disc, the servo track writer including a position control system for controlling the position of the actuator, the position control system further comprising:
Dependencies are inferred from the claim text.