I just read about Overdrive, don't have any actual experience with it, but are you sure about the 16 CD's? Could it be 16 "parts"? According to the information I read, you can burn multiple parts to a CD using the Overdrive Console. It looks like all of these have MS DRM and can be played and burnt using WMP or the Overdrive Console if the copy flag is set for a particular title (not all are allowed to be copied). Anyway, I suggest reading the docs for the Overdrive Console. It appears that the largest size for a "part" can be as high as 36MB.
I just reread the part about burning to CD's and here is what it says:
" If you have selected more than one Part to burn to CD, the Burn Wizard will prompt you to enter a new CD as each Part finishes burning. When all Parts are successfully burned to CD, the Burn Wizard displays a 'Success' message."
Doesn't make much sense to me. If the max size for a "part" is 36MB you are wasting a lot of disk space by not being able to burn multiple parts on one CD.
Now this is a little contradictory but it's taken from the Overdrive Console burn instructions:
OverDrive Media Console offers a built-in Burn Wizard, allowing you to burn audio titles to CD where permitted by the publisher. The Burn Wizard brings the convenience of MediaMarker navigation to your CD player by creating a new track on CD for each MediaMarker in the Part. Select individual Parts to burn to CD, or burn the entire title - the OverDrive Media Console Burn Wizard provides options to suit your needs. You don't need to install additional software; everything you need is incorporated into OverDrive Media Console."