Dutch Bru & PJ2
Translation woes make the QAR comment in Section 1.3.1 unclear in English.
The last sentence of the official Spanish version of Section 1.3.1 leaves no uncertainty as it states Teledyne verified a format incompatibility between the FDAU and the MO disc.
It does not detail the mismatch, but expanding PJ2's point on likely fleetwide mix of FDAU's, all optical QAR's use 90mm MO discs that look the same regardless of capacity or formatting.