Android, because between this one, Linux, and Windows:
it's the one I need to care less about the OS. The OS (or how does swirling transition animations look better in your beloved distro GUI) should be just an invisible, unobtrusive tool to run your apps, not something that matters or requires babysitting nor tinkering.
it's the one running the apps I use the most, FOR ME, as opposed of for work
And don't use root for anything that doesn't need root.
Two way roads.
If they didn't exist today and someone came up with the brilliant idea of having people in control of machines (cars or bikes) moving in opposite directions at 50mph, separated by a few feet and a painted line, it would be dismissed immediately.
Wrong community, wrong advice, and posted twice.
Wrong community, wrong assumption, wrong problem, wrong solution.
As far as I can remember, it was both, as it was an educational tool developed to teach children the basics of programming while playing it as a game.
What is the filesystem type? If it's btrfs, maybe it's the snapshots.
One more interesting feature was the "write lock" switch on the 3.5" ones, a sliding button that covered one of the squared holes on their edges. The floppy drive would sense that and refuse to write on them.
On the 5.25" it was a notch cut on the side (there were punchers for that). To write on a "protected" disk, you'd cover the notch with adhesive tape.
My daughter found a 3.5" floppy in a drawer a couple of years ago (she was 20) and went "What is this? It looks just like a 'Save' button!" :)
I'd try:
lsof (shows processes x open files)
or
strace (shows system calls, including file access)
Check the answers for this question:
https://unix.stackexchange.com/questions/58887/how-do-i-monitor-opened-files-of-a-process-in-realtime