@george1421 Hi, I already added the second disk, this is the result of the command:
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 1008K 1 loop /snap/gnome-logs/61
loop1 7:1 0 3,7M 1 loop /snap/gnome-system-monitor/107
loop2 7:2 0 14,8M 1 loop /snap/gnome-characters/359
loop3 7:3 0 42,8M 1 loop /snap/gtk-common-themes/1313
loop4 7:4 0 4,2M 1 loop /snap/gnome-calculator/544
loop5 7:5 0 54,5M 1 loop /snap/core18/1265
loop6 7:6 0 89,1M 1 loop /snap/core/8268
loop7 7:7 0 89,1M 1 loop /snap/core/8213
loop8 7:8 0 54,6M 1 loop /snap/core18/1279
loop9 7:9 0 156M 1 loop /snap/gnome-3-28-1804/91
loop10 7:10 0 156,7M 1 loop /snap/gnome-3-28-1804/110
loop11 7:11 0 3,7M 1 loop /snap/gnome-system-monitor/111
loop12 7:12 0 956K 1 loop /snap/gnome-logs/81
loop13 7:13 0 44,2M 1 loop /snap/gtk-common-themes/1353
loop14 7:14 0 4M 1 loop /snap/gnome-calculator/406
loop15 7:15 0 14,8M 1 loop /snap/gnome-characters/367
sda 8:0 0 9,1T 0 disk
├─sda1 8:1 0 512M 0 part /boot/efi
└─sda2 8:2 0 9,1T 0 part /
sdb 8:16 0 9,1T 0 disk
├─sdb1 8:17 0 16M 0 part
└─sdb2 8:18 0 9,1T 0 part /media/serv/Nuevo vol