[tlug] Disappearing Disk Space

[CL <az.4tlug@example.com>]

Over the past few months, I've noticed small amounts of hard disk space 
disappearing from my desktop machine.  It is "only" a couple of Gb, and 
I am not certain of the exact amount as I've been doing a lot of playing 
around with virtual machine disks; adding and subtracting different 
installations, but all of these have used fixed size disks.  I noticed 
that over 1Gb of free space went away just before Christmas and doesn't 
appear to be related to the recent Debian kernel upgrade.  I am not 
finding any hidden files, either.

Is there a way to show and list all recent write activity and file size 
change?  I thought there was but am not finding it.  I confess that I 
may be Googling the wrong question(s).

--
CL