Really? You think that less than 1MB/s worth of background, mainly cached file access (not HD access) is going to have a significant effect on a machine writing a tiny <10MB/s stream to another partition of a HD capable of over 100MB/s of continuous read/write? Even with the added seek time it's a trivial task.
Your argumentative nature has backed you into yet another ridiculous position AEP. I suggest you save it for FC though.
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