Allegedly, on or about 30 April 2018, JD sent:
> I had no idea tha Caja would be doing this, and what's
> more is that all it's i/o was to/from the boot disk.
>
> About 30 minutes after I sent the email, it's i/o load
> wen down back to near zero.
Perhaps a thumbnailer plug-in trawling through large files trying to
build up preview icons for the files?