Title is stupid.
What I mean is that when you create an ext2/3/4 partition, by default 5% of the disk is allocated as reserved system space.
So things like this happen:
If I have a size 443G disk and I used 420G, I should have 23G unused space, no?
So, imagine my surprise when this started to pop-up every so often:
What you do is alter the percentage of the aforementioned reserved system space to something more reasonable for a large disk, like 1%, by issuing this command:
$ sudo tune2fs -m 1 /dev/sda7
Take note that doing this is advisable for non-root partitions, since the reserved system space is reserved for a reason. This is one upside of having a partition for all them data separate from the OS, I think.
Btw, I blame youtube-dl for all that disk usage, because I download Youtube now, because adaptive streaming don’t cache videos anymore, and I don’t want to download the same data repeatedly when I watch instructional stuff and music videos, because I am billed by the amount of data I consume*, because I live on some island where internet access is only available wirelessly.
Plus, www [dot] skytorrents [dot] in. No ads, no popups. Hope it stays that way.
* Sort of, and yes, for most, but for me, not exactly.