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Thanks to our kind host for the info. The latest ROM4 specification for UHD discs includes a feature called "dual-zone formatting" where MPEG transport files closer to the outer edge of the disc are allowed to have higher maximum bit rates than content in a region near the center. It does require that mastered discs have layer breaks that might not be at the max sector size. I know from experience that regular Blu-ray discs (ROM2) could generally accommodate the layer break location being moved to the max sector size of layer 0 unless the project in question had certain rare characteristics such as seamlessly branching content located near the mid-point of the disc. ROM4 dual-zone seems like it's a different beast, at least at this stage of the product lifecycle. Would anyone else please share your experience with burned UHD dual-zone triple-layer discs that play correctly at >100 Mbps without authoring-assigned layer breaks?

Hi, I'm experimenting with making my own higher-resolution discs to the BD ROM4 spec with triple-layer 100 GB capacity discs. Triple-layer discs imply two separate layer breaks. Without going into too many details, setting arbitrary layer breaks is important to me so that I can ensure that content encoded for the highest data rates are in the proper physical location on the burned disc. I don't have any BDXL hardware or TL media at the moment to test this myself, but does ImgBurn 2.5.8.0 support setting more than one arbitrary layer break based on sector sizes?