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On my Debian GNU/Linux desktop/server, I had to disable the KDED Media Manager because it was accessing the disk regularly which made the disk activity light flash on a regular basis.
So, things to check:
1) daemons that watch for media changes (pmount, hal) or file/directory changes (famd - file alteration monitor). Maybe one of these is polling the disk every second to look for changes?
2) some process that writes a log message every second, though I don't know what that would be.
What is different about the server with the blinking disk activity light as compared to the other two? Do they all have the same OS version? Do they all have the same packages installed? Does one boot into a GUI and the others to the command line? Does "top" show the same active processes on all three systems?
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