What Blu-ray Disc variants are available?
As with CD and DVD, Blu-ray Disc media comes in pre-recorded, recordable and rewritable variants. The pre-recorded disc is called BD ROM, and usually contains movies or re-issued TV shows in High Definition format. The recordable disc is called BD R, and can be used for archival of huge amounts of data or video. The rewritable disc is called BD RE, and offers the same large capacity in a disc format that allows for repetitive usage.
