2gb reserved right of the bat, after formating the new drive with btrfs??
Most non-Btrfs tools will inaccurately report usage information for a Btrfs filesystem. See here: https://wiki.archlinux.org/title/Btrfs#Displaying_used/free_space
Try using a Btrfs tool to get a more accurate read on how much space is being used.
btrfs filesystem df [mount point for device]
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@BluishHumility is right…may I suggest you to check the BTRFS Assistant by @dalto…it not only shows FS usage, but allows you to deal in an easier way with Snapper and the maintenance tools
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hdd is mounted in /run/media/enio
/run/media/enio/wd ultrastar hdd
i have btrfs assistant installed will look later when i switch to linux if i can see something there…
and that other method i write btrfs filesystem df /run/media/enio/wd ultrastar hdd ?
The overview tab shows disk usage information.
If that is where the disk is mounted, then yes. If there are actually spaces in your directory names, you will have to quote the path or escape the spaces.
hmm, maybe rename the hdd to make it easier, since i don’t know how to do what you said there…
To escape spaces when interacting with a file or directory from the command line, use the backslash (\) before each space.
ls directory\ with\ spaces
Without the backslash, you are essentially giving a separate argument after each space.
Another way you can do it is with quotes.
ls "directory with spaces"
Renaming the directory so it does not include any spaces would be the easiest and best solution, in my opinion.
ah, thank you, i will do just that, just to be safe… and i wondered before if the spaces will complicate things down the line 
ok i checked
it is just the label that is wd ultrastar hdd, does that matter?
it says something about identify by device node
Normally you would not use a partitioning tool for renaming a directory. However, in your case it looks like you are using an auto-mounting tool and it is setting up a mount point based on the label for the filesystem.
Try renaming the label (you may need to unmount the device first) to something without spaces, such as wd_ultrastar_hdd or something like that. Then allow the system to auto-mount and see if it uses the amended label name for the mount point.
i did fire up assistant,to see if i can see something there. the only disk i see there (similar like you showed on this picture) is my nvme which has linux installed on it. the other hdds are not visible there, i dont see an option to check other disks.
It is a great program tho, it should be standard when installing btrfs… oh and i did what you suggested, changed the name of the label, instead of spaces i put _ just to complicate things less.
You can switch to another filesystem here:
i think i have only one option, i clicked that before, i will need to check again when i boot up linux.
update, i was right, there is only one choice there…