Problem with saving files in the cd-rom..

Hi,
I have "really big problems" when I want to save datas
(4 eg. a sample) in the cd-r inside my mpc 4000..
First of all when I go inside the Utlility Page to
Memory To CD to Save the sample that I Loaded , the screen shows Empty Drive (I don't know if this is a problem..)
and then everytime I try to save something and I press Do It, the screen shows Not Found.. Is there any proper way to save sample (or
to load them before save) in the CD-R ? ..I hope somebody understand.. Please help me

Do you have a CD-R in the CD drive? Try using a different CD-R.

Thanks for the answer!!

My CD-r is a Plextor 52/24/52A..
and I thought it was a right one!?

(Is there no possibilty that I did something
wrong in the procedure of saving on the cd-r?)

Oops, you mean a cd-r not a cd-drive..
Ok, I'll try with a different cd-r hoping
this can be the only problem..
Thanks!