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Regarding the head parking being also a feature to prevent damage to the disk, I see this as mostly unnecessary for a desktop hard drive. I can see why it is useful for a laptop as it gets moved around a lot, but I would imagine desktop PCs are stationary almost all the time when powered on, I may be wrong with my generalization. In the case that the drive is used as an external drive in an enclosure, this feature will be useful for damage prevention. One thing to note though is that I have found that sometimes the parking appears to interfere with the picture when watching a video file.
The artifact that you see is probably influenced by the way avi videos are encoded, but it appears to be caused by the parking or unparking.