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Here are some screenshots, so you know what I'm talking about:

Red Activity

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Green Activity

enter image description here

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up vote 4 down vote accepted

One is reading from the disk (green I think; the same color you'll see when reading from a CD or DVD), and the other is writing to the disk. I know I ran across this in the manual, but quickly skimming the table of contents and checking a couple sections I'm not finding it now.

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