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First, you’ve to create a new partition.
You can list all available storage device with:
lsblk
If your disk is new, the new device will appear empty (without children on the tree).
Then:
fdisk /dev/sdc
Press m to show the manual.
To create a partition larger than 2TB, you’ve to use a GPT partition (g) then create a new extended partition (n) then with (p) it will show you how the partition will like before you write (w) them.
Then, lsblk will show the device with the new partition, e.g.:
sdc 8:32 0 5T 0 disk └─sdc1 8:33 0 5T 0 part
Then format the new partition /dev/sdc1 with the specified filesystem (e.g. ext4):
mkfs -t ext4 /dev/sdc1
If you haven’t take not of the UUID shown by mkfs after format, use blkid command to list the UUID of the device, so if device name change the fstab is still valid.
And add to /etc/fstab (put the last 0 to 1 to check filesystem on startup):
UUID=xxxxxxx-xxx-xxxx-xxx-xxxx /mnt/mydata ext4 defaults 0 0
To get the UUID later:
sudo blkid /dev/sdc1
Create the mount directory with:
mkdir /mnt/mydata
Then mount the new partition with:
mount /mnt/mydata