Time machine backups filled my 4TB external HD. To free space, I deleted a handful of the particular backups from:
Those files ended up in the trash bin and trying to "empty" the trash bin erred indicating the folder was in use. So, I deleted the contents through terminal:
cd /Volumes/"Winston's 4TB"/.Trashes/ sudo rm -rf /501/2018-0*
Finder now shows the trash bin being empty, but the space has not been freed up on the drive. How do I recover that space?