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I guess I'm a tad confused; I thought you suggested getting a Pioneer because it has better error correction, but then said I wouldn't have any better luck with a Pioneer drive?

I'm sure I'm misunderstanding something, so forgive the confusion. I realize no reader is going to fix the obvious ...

Definitely already tried washing it as suggested with no improvement. Shame on me for not taking better care of it.

The disc in question is unwatchable on a regular player so physical defects are undoubtedly the issue.

I still might pick up a Pioneer drive as a last backup . I'll have to go back ...

Another bit of information that leads me to conclude the 1.5A supply with the UGREEN adapter was the culprit, I *failed* to rip one 4K disc on two different drives, but when I changed the power supply on the new one, the errors returned for that disc on each device started matching.

For a final ...

Thanks for the reply and the advice.

The UGREEN adapter I'm using is externally powered. However, because I had success with the regular BR but not the 4K BR, it made me at least *suspect* the idea that the 4K discs were drawing more power than the UGREEN supply was giving. It is rated for 1.5A at ...

I recently purchased a new internal LG WH14NS40 SATA drive, connecting it to my laptop via an externally powered UGREEN SATA to IDE adapter. I immediately flahsed it up to WH16NS60 with no problems whatsoever, then proceeded to rip two known-good regular BluRays with no problem whatsoever. All good ...