BD50 UHDs on non-UHD-friendly drives

[flashback8]

Hi. This may be slightly off-topic, although I think it's interesting and somewhat relevant. :) I know there are three UHD BD profiles: BD50, BD66, and BD100. Can anybody confirm that a BD50 disc can be read on a plain BR drive? I have a disc that I highly suspect is BD50. Alas, when I place it in an old (circa 2008) BR drive, the drive is unable to read the disc. I don't know if it's because the disc is really BD66 or if it's due to something more technical, like the disc using a UDF version that the drive can't handle. (I know the old drive can't decrypt the disc. That's fine. I'm just curious.)

While we're at it, is there any way to tell the difference between a BD50 and a BD66, my sight or by analysis? I know BD66 allows for higher bitrates. That can be a sign, although it's not guaranteed.

Thanks.

[Billycar11]

there is also BD25
to tell what BD a disc is use https://www.blu-ray.com/ they have it listed in the specs.
not sure if original bluray drives supported dual layer discs or just single a BD50 would be dual layer

[MartyMcNuts]

Hi. This may be slightly off-topic, although I think it's interesting and somewhat relevant. I know there are three UHD BD profiles: BD50, BD66, and BD100. Can anybody confirm that a BD50 disc can be read on a plain BR drive? I have a disc that I highly suspect is BD50. Alas, when I place it in an old (circa 2008) BR drive, the drive is unable to read the disc. I don't know if it's because the disc is really BD66 or if it's due to something more technical, like the disc using a UDF version that the drive can't handle. (I know the old drive can't decrypt the disc. That's fine. I'm just curious.)

While we're at it, is there any way to tell the difference between a BD50 and a BD66, my sight or by analysis? I know BD66 allows for higher bitrates. That can be a sign, although it's not guaranteed.

Thanks.

Any regular BD drive can read both BD25 and BD50 discs. I have plenty of blu-rays that are on BD50 discs. I seriously doubt that the same drive could read a UHD of any disc size unless the drive is made UHD friendly.

I'm pretty sure that standard BD is only ever BD25 or BD50 and UHD is BD66 or BD100. I don't ever recall seeing a UHD that is BD50 (even though the profile exists!)

If you have a BD50 UHD and a standard blu-ray drive, give it a try and let us all know!

[flashback8]

Thanks, everyone. I have no idea if the discs I have are actually BD50 UHDs! I just suspect it, given the bitrates. Or, to be more precise, I suspect what's happening is these labels tested their discs on burned BD50s and then just shot them over to the pressing plant, which probably used BD66 discs for whatever reasons. The only disc I have that I know for sure is a BD50 is the Scandinavian "Django" release, and that's a burned disc using AACS1.