The difference in UMD disc labeling where some have "UMD Universal Media Disc" printed on them and others just show a plain white circle, mostly comes down to publisher design choices and the timing of the release. Early UMDs, especially those launched around the time of the PSP’s debut in 2004, often featured the full branding prominently. As the format matured and eventually declined, many publishers opted for simpler, more cost-effective designs, sometimes omitting the logo entirely. There wasn’t a strict standard enforced by Sony, so the appearance of UMDs varied depending on the studio, region, and whether the disc was a game, movie, or budget reprint. While the presence or absence of the logo loosely correlates with the release date, it’s not a hard rule, just a reflection of shifting priorities and branding decisions over time.