Don't know if this helps but the same CD drive is used on the TRITON STUDIO, PA1X Series and the D12 Digital Recording Studio. Like you say the picture looks like a standard laptop CD drive; don't they use a miniature centronics connector? This is going to be the tricky point; a lot of laptop manufacturers uses their own specific interface (so you are tied to their upgrades) and I don't know if Korg do the same.
A side issue - I was informed unofficially at a shop that a standard "Lite-On" 40 x 12 x 48 CD writer will fit into the Zoom MSR802 digital 8 track.
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John Allcock