my old method was to type mount, then look for the correct block device but this isn't really easy now.
1. udisksctl power-off -p /media/user/sea*
..... # fails with an lookup error
2. sudo udisksctl power-off -b /dev/sde
..... #fails with an error because it's mounted
3. umount /dev/sde1 ; ( then #2)
....#immediately remounts the disk and opens it in the file manager.
WTF.
