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Specifies the desired internal write laser setpoint power. This is not
necessarily the same as what comes out of the head.
The difference between the desired power and the measured power provides an
error signal to the PID controller which determines the current for the
write laser diode.
The measured power is the measurement from the laser power sensor converted into
Watts using the wpwrcal parameter.
The relationship between the laser diode current and the optical output power
varies from diode to diode and over time.
Staccato is implemented using a wide and narrow mode for each media type. The
parameter wpower is for wide mode while the parameter wpowern is for narrow
mode.
The wpower and wpowern are used in laser ("head lsrmode") modes 0 and 3 while
wpowere is used for laser modes 1 and 2.
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