| 摘要 |
<p>The present disclosure relates to a disk drive (10) comprising a rotating disk (12) with a recording surface (14), a transducer (16) in communication with the surface and swept radially over the surface by a servo-actuator (18), a variable gain read amplifier (20) connected to the transducer, an analog-to-digital convertor ADC (22) attached to the variable gain amplifier, an erase frequency oscillator (24) coupled to the transducer for erasing of the disk surface, a memory (26) for storing digital outputs appearing at the ADC, and a controller for signalling the servo-actuator (30) 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 (29) 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.</p> |
