You need to use the mount command. # Open a command-line terminal (select Applications > Accessories > Terminal), and then type the following command to mount /dev/sdb1 at /media/newhd/. You need to create a mount point using the mkdir command. This will be the location from which you will access the /dev/sdb1 drive.
$ sudo mkdir /media/newhd
To mount the drive, enter:
$ sudo mount /dev/sdb1 /media/newhd $ df -H
A Note About Automatic Mount At Boot Time
You need to edit /etc/fstab file, enter:
$ sudo vi /etc/fstab
Add the following line for ext3 file system:
/dev/sdb1 /media/newhd ext3 defaults 0 2
Add the following line for Windows FAT32 file system:
/dev/sdb1 /media/windowshd vfat defaults 0 2
Save and close the file.