What is a Blu-ray structure

A Blu-ray disc consists of a certain structure, that means as long as a folder is a Blu-ray folder, same kind of files or folders can be find in the folder. But what does a Blu-ray folder look like? What is in a Blu-ray folder? Here I'll introduce briefly for you:

AACS: A directory file. It contains disc level content certificates and media key block data.
BDMV: A directory file. It contains basically all the meaningful content of the disc.
AUXDATA: A directory containing assorted disc-specific metadata.
BACKUP: A directory containing subdirs with backup copies of certain small content. Like .BUP files on DVDs.
BDJO: A directory containing BD-J objects, on discs that use BD-J.
CLIPINF: A directory containing metadata files for the M2TS streams in the STREAM subdir.
JAR: A directory containing JAR (Java archive) files other than the BD-J content. (JAR is basically ZIP with some extra metadata.)
META: A directory containing subdirectories with a metadata XML file, and sometimes thumbnail images, depending on who did the authoring.

PLAYLIST: A directory containing binary playlist files, which describe the playback program chains. Some studios use playlists to implement seamless branching (Disney loves to do this, especially with their animated movies, subbing in language-specific segments for opening titles, credits, etc.).
STREAM: A directory containing the actual audio/video streams, in MPEG-2 transport stream format.
index.bdmv: A metadata file containing an index of the titles.
MovieObject.bdmv: Some sort of object metadata file describing the movie(s) on the disc.
BDSVM: A directory, contains BD+ virtual machine metadata. (BD+ is an additional content security mechanism, favored largely by Fox, which runs an abstract virtual machine to transform stream data at runtime to make the video watchable.)
CERTIFICATE: A directory, contains security certificates that the application(s) on the disc use, including occasionally revocation lists and such.

In fact, most Blu-ray can be stored as BDMV and CERTIFICATE folders. BDMV is a similar file format which is a container format for multiplexing audio and video. However video and audio are handled differently on commercial BDMV (Blu-ray Disc Movie) discs than on the recordable Blu-Ray discs sold for home computer use, most media player can't directly play the BDMV Folder due to the copy protection. Fortunately, along with a third-party program, you can quickly copy the entire Blu-ray disc into a intact BDMV folder without any protection so that you can easily access it for playback or burning a new disc for storage.

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