[CentOS] iso creation with dd

I placed a CD in a drive.
   I ran
     sudo dd sudo dd if=/dev/cdrom of=HMI_B_Image_File_4-23-09_disk_1.iso

It completed.  I then transferred the ISO file to an XP machine, use
Sonic to burn the ISO file to another CD, and there was a file missing
(the largest) in the burned CD.

Seems like the data got transferred through the dd, but not a file
name.  What might I be doing wrong?
   === Al