USB Linux não copia arquivos para HDD interno

Question

Eu obtive a configuração do Kali Linux em um USB e tenho tentado copiar arquivos para o meu disco rígido, mas recebo o erro:

cp: cannot create regular file '/media/root/OSDisk/Users/User/Documents/file.txt': No such file or directory

Mas copiar da unidade funciona bem. Meu kernel Linux é o 4.15.0. lsusb retorna:

Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
hub
Bus 003 Device 005: ID 17ef:1004 Lenovo Integrated Webcam
hub
Bus 003 Device 002: ID 0781:558a SanDisk Corp. 
hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 003: ID 0a5c:2145 Broadcom Corp. BCM2045B (BDC-2.1)[Bluetooth Controller]
Bus 002 Device 002: ID 08ff:2810 AuthenTec, Inc. AES2810
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

e df retornam:

Filesystem     1K-blocks      Used Available Use% Mounted on
udev             1942012         0   1942012   0% /dev
tmpfs             393220     11992    381228   4% /run
/dev/sdb5       52014088  21381828  27960388  44% /
tmpfs            1966100     19920   1946180   2% /dev/shm
tmpfs               5120         4      5116   1% /run/lock
tmpfs            1966100         0   1966100   0% /sys/fs/cgroup
tmpfs             393220        12    393208   1% /run/user/131
tmpfs             393220        44    393176   1% /run/user/0
/dev/sdb1        2867168   2867168         0 100% /media/root/Kali Live2
/dev/sdb2            684       666        18  98% /media/root/Kali Live1
/dev/sda1      246532092 214315320  32216772  87% /media/root/OSDisk

E ls -ld vai dar:

drwxrwxrwx 1 root root 12288 Jul 21 10:53 /media/root/OSDisk/Users/User/Documents

Estou logado como usuário root.