On Raspbian I have noticed that the panel's process regularly performs disk writes (every 60 seconds):
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$ pidstat -dl 600
Linux 4.14.79-v7+ (localhost) 01/15/2019 _armv7l_ (4 CPU)
03:11:53 PM UID PID kB_rd/s kB_wr/s kB_ccwr/s iodelay Command
03:21:53 PM 1000 2195 0.00 0.13 0.00 0 lxpanel --profile LXDE-pi
03:21:53 PM UID PID kB_rd/s kB_wr/s kB_ccwr/s iodelay Command
03:31:53 PM 1000 2195 0.00 0.13 0.00 0 lxpanel --profile LXDE-pi
03:31:53 PM UID PID kB_rd/s kB_wr/s kB_ccwr/s iodelay Command
03:41:53 PM 1000 2195 0.00 0.13 0.00 0 lxpanel --profile LXDE-pi
03:41:53 PM UID PID kB_rd/s kB_wr/s kB_ccwr/s iodelay Command
03:51:53 PM 1000 2195 0.00 0.13 0.00 0 lxpanel --profile LXDE-pi
03:51:53 PM UID PID kB_rd/s kB_wr/s kB_ccwr/s iodelay Command
04:01:53 PM 1000 2195 0.00 0.13 0.00 0 lxpanel --profile LXDE-pi
04:01:53 PM UID PID kB_rd/s kB_wr/s kB_ccwr/s iodelay Command
04:11:53 PM 1000 2195 0.00 0.13 0.00 0 lxpanel --profile LXDE-pi
Thanks.
UPDATE: Upon further investigation it turns out that this seems to be a serious bug. "Wireless & wired network" component appends every 60 seconds a line
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"** Message: wlan0: Received scan results"