Good day, Recently I have noticed these strange files showing up on my Hard Drive.I have a 27" iMac which currently has OS X 10.6.8. I don't know what causes them to show up. And they appear to be harmless but nevertheless I'd like to know what's causing them. I've attached a screenshot of my hard drives so that you can see what I mean. I've also attempted to open these files and here is a sample of the info found in them: kernel size = 5 (range 3..15) volume thresh = 4.0000 t1 = 10 gray step = 256.00 gray diff thresh = 2560.0000 resolution = 300 scale = 100 effective res = 300 Tdustnscratch: level = 2 Tdustnscratch: start time: Thu Feb 12 12:08:02 2015 Tdustnscratch: begin detect: Thu Feb 12 12:08:02 2015 Tdustnscratch: begin applyMedianFilter: Thu Feb 12 12:08:02 2015 Tdustnscratch: end detect: Thu Feb 12 12:08:02 2015 Tdustnscratch: begin reconstruct: Thu Feb 12 12:08:05 2015 The info in each file looks the above and sometimes it repeats multiple times and other times it's just once or twice. Could someone help me please?