It's possible the driver backed the drive off to PIO mode. PIO can get choppy when things like video decoding are going on.
Check device manager, IDE controllers, IDE channel for that drive. Make sure advanced settings allow for "DMA if available" for that device. If it's already set for DMA, look below at "Current transfer mode." If it isn't using a DMA mode that could tell you the drive is having issues and causing the driver to back off.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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