Sat Nav MKIV Very Strange Question?

[brucemillar]

Folks

I think I may have lost the plot here?

Last week, I was attempting to fix an issue with MKIV Nav (now resolved).

But here is the thing...

I am sure, I put a genuine BMW Map, in the drive and then by mistake (I forgot there was a disc already in there) I put another map disc in the drive. That map disc has been accepted and is working but keeps freezing the unit with "error reading disc"

Am I mad here? Is it possible that I could have two discs in the drive but only one working and being able to be ejected?

For the life of me, I cannot find my original genuine BMW disc anywhere? I know I did install it in the drive. I am now convinced that it is still in there.

Before I reach for the screwdrivers, can anybody tell me if what I am thinking has happened is possible? I can only imagine this scenario, if the original disc is somehow stuck, but allowing the next disc to slide underneath it and still be read.

Failing this explanation, the disc fairies have crept in and had it away with my original disc, under the cover of darkness. I have tested my sanity by counting fingers and toes and all three of my testicles.

Thoughts folks please?