Unable to mount /cd/boot/fs/qnxbase.qfs as /qnxbase


I’m installing 6.2.1 to several new PC with new hard disk from a MSI CD/RW.
The new hard disk is at primary master while the RW is at secondary master.
Amount these new PCs, some use MSI CR52-A2 of revision B and some found to
be revision C.
There are problems with the revision C type.
Did any one encounter this also. Any idea to explain this?

Thank you in advance,