Yes, I was attempting to download directly to the cdrw. According to the file attributes it is only 2026KB so I wouldn't think it would exceed the Windows memory limit for temporary transfer. Also, I can download it to the hard drive so that would indicate to me that I am not exceeding the memory limit. Once I get it to the hard drive, I can copy it to the CDRW normally.
Wait a minute, I may have discovered my error. I was attempting to save a copy (using the save icon at the top of the Adobe window) of the opened .pdf file to the CDRW instead of copying it which is what I did when I burned the CD from the hard drive. I didn't realize that .pdf files must be compressed? Anyway, the deed is done for now. Thanks.