Universal Media Disc - Wikipedia
File:Universal Media Disc, Minidisc and Compact Cassette - size comparison.jpg - Wikimedia Commons
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Sony Goes Official With Disc-Less PlayStation Portable | WIRED
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:max_bytes(150000):strip_icc()/pspgameboy03-56a790c93df78cf772972541.jpg "5 Reasons Why Sony's Universal Media Disc Failed")
5 Reasons Why Sony's Universal Media Disc Failed
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携帯ゲーム機PSPで採用された60mm光ディスク「UMD」（1.8GB、2004年頃～）：ロストメモリーズ File009 | テクノエッジ TechnoEdge
:max_bytes(150000):strip_icc()/umdfront-56a78dd93df78cf7729702ab.jpg "5 Reasons Why Sony's Universal Media Disc Failed")
5 Reasons Why Sony's Universal Media Disc Failed
UMD Disc for Sony PSP - 3D Warehouse
ユニバーサル・メディア・ディスク - Wikipedia
Bummer: Sony Confirms PSP UMD Discs Won't Transfer to Vita | TIME.com
/cdn.vox-cdn.com/uploads/chorus_asset/file/13879861/sony-psp-umd.1419962925.jpg "PS Vita will use UMD Passport app to provide discounted downloads of UMD games you own - The Verge")
PS Vita will use UMD Passport app to provide discounted downloads of UMD games you own - The Verge
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Universal Media Disc - Wikipedia
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