I have 2 \* 500-GB HDDs.  

What is the path for each of the disks?  

On *OSX* I can just do: 

```
$ cd /Volumes/DiskName/FooDirectory

```

How can I do that on *Ubuntu*? How can I navigate to files in a HDD using a terminal? `/dev` and `/dev/disk` are not making sense to me.