I have purchased a 8GB Sandisk Compact Flash Card Ultra II and a pcmcia adapter.
I have the same setup on my FANUC 18-i. On my control I did have to format the card while it was connected to the machine. I am not familiar with the O1MC but assume that the I/O stuff is the same. Does your control have a CRT with soft keys to change the display? If it does, you might want to try this:
-Push in the (2) far right soft keys while powering up the machine. If your control is anything like mine, you should get a screen whth several options for the machine. One of the options should be to format the memory card. On my controll it is option #7. Cursor down to the correct option, hit select and follow the prompts.
Hope this helps.
It is the poor craftsman that blames the tool