Hi celia sorry for the confusion I caused,
There are two main upgrade paths you could choose
1 is to fit a CD Writer (this will create your CD's with appropriate software)
2 is to fit a DVD writer (This will create your CD's OR DVD's with the appropriate software)
You need to ask yourself if you need the storage capacity of a DVD ..... unless you are storing large quantities of video files or very high quality picture files I would suspect the answer is NO ...
to put it into context 1 CD is equivalent to approx 450 Floppy discs and 1 DVD Disc is the equivalent of 7 CD's
A suitable internal CD writer drive can be obtained for as little as £17
http://www.dabs.com/uk/channels/components/cdanddvdreaderswriters/fitting it is relatively straightforward if you have no qualms about opening up your machine's case ..... If you do try to get someone else to fit it for you.
Another option is to go for an external unit which would plug into your system and be available without opening the case ....... this is a much more expensive option £70 - £100.
Regarding the CD types ...... the CD Writer can write to two types of CD
type 1 is a one off operation .... ie you Create (burn) the CD and the information is put on the CD in one operation ....
type 2 is what is referred to as CD RW ..... these disks can be written to several times adding a litlle information each time so that all of the information is available to the person viewing the contents