PlayStation Portable senior marketing manager John Koller spoke with the Pocket Gamer site about the much-maligned UMD format. The disc used in the PSP for both games and movies, few stores carry UMD movies any more. Just the same, says Koller, Sony supports it 100%. From the interview: "'UMD possesses many strengths, from size to form factor to portability,' he says. The same can easily be said of the UMD's cartridge counterpart on Nintendo DS. However, ease of UMD manufacturing is seen as a winning benefit. 'Duplication of UMDs is much easier, cheaper than cartridges,' Koller adds. 'We've really optimized time and cost by going with a disc-based format.' On the topic of UMD weaknesses, Koller is candid: 'There's no question the biggest weakness is related to porting games from other platforms. Publishers are concerned about the size of UMD because they can't cram a DVD game on to it.'"