linux usb hdd format, mount

lsblk -o NAME,SIZE,MODEL,SERIAL,FSTYPE, MOUNTPOINTS

sda       9.1T HGST HUH72101 7PKGW77C0001
├─sda1     16M
└─sda2    9.1T                            ntfs
nvme0n1   1.8T KIOXIA-EXCERI XE8KF1NUZ0EA
├─nvme0n1p1
│           1G                            vfat     /boot/efi 
└─nvme0n1p2
          1.8T                            ext4     /
 
format
sudo umount /dev/sda2 2>/dev/null || true
sudo mkfs.ext4 /dev/sda2

mount
sudo mkdir -p /mnt/usb
sudo mount /dev/sda2 /mnt/usb
sudo df -h /mnt/usb