How do you know if you have M2/2a

I just received my 10GB player and I was wondering how I would know if I had a Mark2 or Mark2a unit? My serial number is: 40103714

-Jason
Mark1: #00018
Mark2x: #40103714

You have a Mk.2A.

If you had a Mk.2 it would say "empeg", there would be no mention of Rio, and the serial number would be somewhere under 1000.

Rob

so all the riocar's have the extra memory?

Yup.