Since you deleted a database, the node now doesn’t know is it its data or just you are trying to run it on a small disk?
The current safe minimum is 500GB (and of course 261GiB (Windows uses a wrong measure units) is less than 500GB).
If you are sure, that the path is correct, you may enable a scan on startup if you disabled it (it’s enabled by default), uncomment and reduce a monitoring threshold to less than you currently see as a free space (in SI units 261GiB would be 280.24GB, but it’s better to specify just 200GB
):
Save the config and restart the node either from the Services applet or from the elevated PowerShell:
Restart-Service storagenode
Then wait until all filewalkers will be successfully finished:
After that it’s advisable to comment out the reduced monitoring. It may help to do not destroy your node if the path is wrong.