Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
1999-12-10
2003-09-02
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S077040
Reexamination Certificate
active
06614614
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a method and apparatus for writing servo patterns which precisely define an outer most or inner most servo track position on a data recording disk, and which senses a stop of a power from power supply to return a clock read/write head of a servo track writer and a data read/write head of a hard disk drive device to their stand by position, so that a sticking action of the clock read/write head and the data read/write head onto the data recording disk is prevented.
BACKGROUND ART
Servo patterns are written on a data recording surface of a data recording disk, such as a hard disk, by a servo track writer in a fabrication factory before shipment. In a hard disk drive device using a contact start stop (CSS) scheme, an inner crash stop member for defining an inner most position of a suspension arm which supports a read/write head and an outer crash stop member for stopping the suspension arm to position the data read/write head at an outer most servo track on the data recording surface are provided. When a power is off, the suspension arm is moved to engage with the inner crash stop member, and the data read/write head is landed on a landing zone provided on the inner most position of the data recording disk. To write the servo patterns on the data recording surface, the suspension arm is moved by a voice coil motor (VCM) until it engages with the outer crash stop member, and the servo pattern signal is supplied to the data read/write head from the servo pattern writer. After the servo pattern is written on the outer most servo track, a positioner of the servo track writer moves the suspension arm to a next servo track and the servo pattern is written. In this manner, the outer crash stop member is used as a reference position for defining the first servo track in the hard disk drive device using the CSS scheme.
The hard disk drive device using a load/unload scheme has recently been used in which a load/unload member is provided on an outer edge of the hard disk. When the read/write operation is terminated, the VCM moves the suspension arm toward the load/unload member until a front tab member of the suspension arm rides on a ramp surface of the load/unload member and the front tab member engages with an outer stop member on the load/unload member. When the front tab member rests at the outer stop member, the data read/write head is positioned at an outer disk position.
A first problem in writing the servo patterns on the hard disk using the load/unload member, it is impossible to precisely defining the position of the outer most servo track on the hard disk since the outer most crash stop member as used in the CSS scheme is not provided in the load/unload scheme. Also, a smooth surface of the hard disk using the load/unload scheme has the following second problem. Before the servo patterns are written on the hard disk, a clock pattern is written on a clock track positioned outside of the outer most servo track by a clock read/write head of the servo track writer which flies on the data recording surface of the hard disk. The clock pattern is read by the clock read/write head to define a space between the servo patterns along a circumference direction written by the data read/write head of the hard disk drive device. During writing the servo pattern, the clock read/write head of the servo track writer and the data read/write head of the hard disk drive device fly on the data recording surface. The second problem is that the clock read/write head and the data read/write head tend to stick on the surface of the hard disk when a spindle motor for rotating the hard disk is stopped due to an undesired stop of the power from the power source, so that the clock read/write head and the data read/write head are broken.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a servo track writer and a method for writing the servo pattern which precisely define an outer most or inner most servo track position on the data recording surface.
The object of the present invention is to provide a servo track writer and a method for writing the servo pattern which sense the stop of the power from the power supply to return the clock read/write head of the servo track writer and the data read/write head of the hard disk drive device to their stand by position, so that the sticking action of the clock read/write head and the data read/write head onto the surface of the data recording disk is prevented.
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Murayama Masashi
Saitoh Michiharu
Takeichi Atsushi
Yanase Hirofumi
Bluestone Randall J.
Bracewell & Patterson L.L.P.
Hudspeth David
Slavitt Mitchell
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