Hi, Let me explain you my problem (hope this will help other people in the future) I get an UHD ISO movie from the web. Mounting the ISO in daemon tools, then my powerdvd 17 recognize it correctly and seems to be working. (For information : Selection menu of the disc appears but when i launch the movie i got the sound, not the pictures, probably because my screen isn't suppport the HDR... but when i lplay the m2ts file on VLC it works great !) I tried to write the ISO on a cheap BDR-TL (imported from japan with amazon)... the disc seems to be OK for my computer, all files is on disc and no write errors. Then i tried to read it on my Samsung UBD-K8500 and this one tell (after making some strange noises) that the support is not readable, or probably dirty... So what do you think about that ? Problem with UBD samsung player ? Problem with the BD-XL ? Thanks for your help and have a good day.