Here it is. /disks is the mount location of my external hard drives.
edit: the other under /disks are just files inside this folder.
du: cannot access '/proc/14104/task/14104/fd/3': No such file or directory
du: cannot access '/proc/14104/task/14104/fdinfo/3': No such file or directory
du: cannot access '/proc/14104/fd/4': No such file or directory
du: cannot access '/proc/14104/fdinfo/4': No such file or directory
987468250 /
984880012 /disks
NAME FSTYPE LABEL SIZE RO TYPE MOUNTPOINT PARTUUID UUID
sda 3.7T 0 disk
├─sda1 ext4 200M 0 part af39fadd-4f71-4fbe-ae82-551205a03e7e 284ce4db-751c-47bf-a01b-2a6c2348f3d4
├─sda2 ext4 TV 1.8T 0 part /disks/TV 28821df4-0dde-4d1a-89ee-1008df2b103c 1443803a-7890-4f73-9b66-87d206f4237b
└─sda3 ext4 Movies 1.8T 0 part /disks/Movies 274406d9-e205-4007-a76e-d6d75fe333d6 55d1999c-a676-4194-8d0f-955bdd83a36c
sdb 3.7T 0 disk
mmcblk0 59.5G 0 disk
├─mmcblk0p1 vfat boot 256M 0 part /boot ad09722e-01 54E3-79CE
└─mmcblk0p2 ext4 rootfs 59.2G 0 part / ad09722e-02 c6dd3b94-a789-4d57-9080-1472f721804b