# How to mount a hard disk as read-only from the terminal

You do not mount '''/dev/sda''', that refers to the entire disk. You mount '''/dev/sda1''' or whatever partition you want. Make a mount point, call it anything you like. 

``` bash
sudo mkdir /media/2tb
```

Mount as Read Only

``` bash
sudo mount -o ro /dev/sda1 /media/2tb
```

When your done, you should unmount the disk 

``` bash
sudo umount /media/2tb
```

See man mount or [https://help.ubuntu.com/community/Fstab](https://help.ubuntu.com/community/Fstab)