As you probably know, the actual drive mechanism in the PWT is a computer DVD drive. We are unable to use them directly however, they are designed specifically for fast random access, and read and write speeds. For our audio processing requirements, requiring quiet running, little random access, and high error correction, custom software is loaded during the transport manufacturing process. One of the ‘features’ of this custom software is to avoid having the drive go into park mode. Park is when the drive decides it is not being used. In Park mode the motor stops turning and the drive head is moved to a safe park location at the edge of the disc.
Pause, Stop, and Park, are all different instructions to the drive and the drive controller. In both Pause mode and Stop mode the drive motor continues to rotate, and the read/write head stays in position, ready to resume the playback process. It is only if the music is not playing for 20 minutes (2 minutes with previous revision drives) that the drive will go into Park mode.
To specifically address your comment, you are correct that the drive continues to spin when Stop is pressed. It will continue to spin until the timeout point is reached. We prefer if the drive does not go into Park during a listening session. It isn’t a big deal, but it does take additional time, and it makes more noise.