1. Start terminal window. The terminal window application will be there under the "Accessories” sub menu of the main "Applications" menu.
2. Type the command "su" to switch to the root user.
3. Type the command "fdisk -l | grep '^Disk'" to find out the name of your second HDD. The second HDD will most likely be named either "/dev/sdb" or "/dev/hdb".
4. Type the command "mkfs.ext3 /dev/sdb" to format the HDD using the ext3 file system. Change "/dev/sdb" by the name of your hard drive.
5. Type "exit" to exit the root session.