I think it should be
/dev/sdc1.
If so, it denotes the first primary partition on your third harddisk.
Explanation:
/dev/ contains all your devices
/dev/sda is your first hard disk (/dev/sdb would be your second and so on ...)
/dev/sda1 is the first primary partition on it (/dev/sda2 the second ...)
If you want to know more details, search the web for the keywords
A mount point is an empty directory within your filesystem, e.g /media/my_disk.
You can create it using
Code:
mkdir /media/my_disk
and then mount your device using
Code:
mount /dev/sdc1 /media/my_disk
On most linux systems, you need to be logged in as the root user to do that.
If you want to make it permanent, search the web for