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There's a built-in four-gigabyte size limit to the PDB, but I doubt that's going to be a limitation to most books going forward. Probably the constraining factor is the 65,536 maximum number of records (data packets, quasi-files; it seems as though Mobipocket splits biggish files into several of these, possibly for faster indexing) in the PDB.
The format doesn't seem to impose any inherent limit on the size of each record, though.
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