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I ran the following bash command to merge several big files

cat file1.txt file2.txt file3.txt file4.txt > merged.txt

The process is very long as the files make about 12 GB each. On the activity monitor (Mac OSX 10.11.3), under the tab called Disk, I see the following entry for the process of interest

enter image description here

How is it possible in this cat process that more bytes are being written than read?

Remi.b
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