发明名称 |
Self-servowriting disk drive and method |
摘要 |
An embodiment of the present invention is a disk drive comprising a rotating disk with a recording surface, a transducer in communication with the surface and swept radially over the surface by a servo-actuator, a variable gain read amplifier connected to the transducer, an analog-to-digital converter (ADC) attached to the variable gain amplifier, an erase frequency oscillator coupled to the transducer for erasing of the disk surface, a memory for storing digital outputs appearing at the ADC, and a controller for signaling the servo-actuator to move to such radial positions that result in transducer read amplitudes that are a percentage of previous read amplitudes represented in the digital memory. Bit-synchronism between tracks is maintained by writing an initial clock track with closure and then writing a next clock track including a regular sequence of clock bursts a half-track space offset such that the initial clock track can be read in between writing clock bursts and the read signal is used to frequency-lock an oscillator which is used as a reference for the writing of clock bursts of the next track. A checkerboard pattern of clock bursts is thus created. All subsequent tracks are built incrementally by stepping off a half of a track from the last track written, which comprises clock bursts, and writing a next new sequence of clock bursts that interlace with the previous track's clock bursts.
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申请公布号 |
US5448429(A) |
申请公布日期 |
1995.09.05 |
申请号 |
US19940274676 |
申请日期 |
1994.07.12 |
申请人 |
CRIBBS, DANIEL F.;ELLENBERGER, MICHAEL L.;HASSLER, JR., JOHN W. |
发明人 |
CRIBBS, DANIEL F.;ELLENBERGER, MICHAEL L.;HASSLER, JR., JOHN W. |
分类号 |
G11B5/596;(IPC1-7):G11B5/012 |
主分类号 |
G11B5/596 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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