PJ2,
At pg 6 the vendor sez both cards (Optical disk or PC card):
http://www.teledyne-controls.com/pdf/FDMS-Brochure.pdf
But here:
http://www.teledyne-controls.com/pdf/OQAR_brochure.pdf
If the unit was not crushed there are chances to recover the cassete info.
On LHR 777 i wrote (Pt):
Soft landing, Hard landing ou Crash landing? | insiderNews
With an analogy between World Economy hit by US financial Tsunami and the BA 777 at LHR. A short article for a Stock Market website.