how can i copy CD's with i.e. 1500 MB

[zycko]

Hi,
my question may sound stupid for someone, who's is
familiar with all the CD-burning stuff, but i have bought my
CD-RW burner about 1 week ago and this is all new for me.
And here is the question:

I have several Game-CD's, that seem to contain more than
1200 MB of data.

The CD-R's, that i can buy, contain a
maximum of 850 MB and this size is far away from the
capacity that i would need to copy such a big CD.

Clone CD tells me, that my 850 MB CD-R is too small to
store this amount of data and doesn't even start the
burning process.

Does that mean, that i really can not copy these CD's, or
do those CD's contain some big files, that just contain blanks
or does the directory of such a CD make the CD-Reader
beleive, that it contains much more data, than is actually
stored on the CD???

and help would be appreciated

zycko