HI, I recently purchased a MBP 15 direct from apple as a refurb. The unit i purchased had a description of - RFB MBP 15.4/2.66/2X2GB/320/SD/512VR-USA. My question is that the "SD" refers to the SD Slot on the side of the laptop correct? The MBP i received does not have an SD slot, but the "older" Expresscard Slot. Is this the only difference? I honestly have no need for the SD slot anyway, so i'm wondering if i should just keep this laptop instead of calling apple and looking to do exchange. would i be missing anything or gaining anything by doing so? Thanks in advance for the help and suggestions.