DD is not working

[cj]

the subject says it all.

I need to make some CD images because im borrowing some cds.

I used "dd if=/dev/cdrom of=/home/debian/name.iso" and it gave me:

dd: reading `/dev/cdrom': Input/output error
0+0 records in
0+0 records out
0 bytes (0 B) copied, 0.0023667 seconds, 0.0 kB/s

I mounted the cd rom before running the DD command

what do i do? i googled it with absolutely no results (or any results 
pertaining to ubuntu 7.04)

--cj