Well, here's how you can do it. First, lets talk about hard drives . These are large capicity storage devices that are found inside your computer. The more practical thing to do, is to buy either a SCSI or USB hard drive. External SCSI and USB hard drives would sit outside your computer and plug into SCSI chain or USB port.
Externals are a little more expensive than internals.
An alternative is removable media such as Zip drives and Jaz drives . They are a great for backing up files and transfering large amounts of data between computers. If you buy a zip drive, be sure to check which model you're getting. They should also come with all the necessary software for making your own CD's. If you just got to make your own CD's, buy one of these.