Amiami says...
DVD Kamen Rider W Forever: A to Z/The Gaia Memories of Fate Collector’s Pack [Toei]
http://www.amiami.jp/shop/?set=engl...08243&template=default/product/e_display.html
From CDJapan, the pack is the two together, so it might be that one. It just says "one-sided, one-layer." That confuses me. There's also this. The DVD alone is considered a "Collector's Pack." Now I'm more confused. I'm leaning back to CDJapan.