Where Is That Darn Disc?

I just spent two hours searching for a disc with photos of the ride that I had in my hands this morning. It's in my place and I have traced and retraced my steps but I still can't find it. As I wrote the last sentence I rererechecked the desk drawer and it's still isn't there! It is so easy to start looking in places that don't make sense - suitcases, junk drawers, bookshelves and among the kitchen pots. But I didn't find it. Oh well I don't know if its age, menopause, brain cancer effects or was I always so forgetful. I forget.