Lost files from CD-ROM formatted as floppy

I copied my emails from Eudora to a CD-ROM formatted as a floppy. Unfortunately Eudora developed a corruption and I lost all my emails except the names of the boxes. Not realising this, I deleted the previous backup from the CD-ROM and copied everthing again which I then found was only the headings. Does anyone know if the emails are somehow saved on the CD-ROM and if so do you know how I can retrieve them? I’d sure appreciate your help.