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Mechanical seeks in a disk drive, if done at periodic repetitions, can cause resonant vibration. The present technique prevents this occurrence with a minimum of performance impact.
English (United States)
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Seek Resonance Detuning
Mechanical seeks in a disk drive, if done at periodic repetitions, can cause
resonant vibration. The present technique prevents this occurrence with a
minimum of performance impact.
The function of this technique is to prevent equally spaced seek starts from
occurring at high frequency intervals, thereby minimizing mechanical resonance
which might occur if seek starts occurred at a constant frequency. A delay is
inserted before such a seek start, but only when it is measured to be equally
spaced from the previous seek, thus minimizing impact on performance.
A counter is reset at the beginning of a seek start. When a subsequent seek
start occurs, the time "T" is saved into a register and the counter again reset.
The counter is continually being compared against the value of "T" saved in the
register. When the counter is one count less than the register, or is equal to the
register, a delay counter is loaded and started. While the delay counter is
counting, seek starts are inhibited. If, therefore, a seek start were to occur before
the delay counter reached its maximum, it would be delayed until the delay
counter finished. The delay counter may be connected up to insert any delay
within a given range or to insert a random delay by connecting it to the higher
frequency divide counters. If the time between seek starts is greater than a
specified maximum, no delay will be inserted, regardless of whether or not the
seek starts are equally spaced...