- BD‐ROM : A read only format developed for prerecorded content.
- BD‐R : A write once format developed for PC storage.
- BD‐RW : A rewritable format developed for PC storage.
- BD‐RE : A rewritable format developed for HDTV recording.
The name Blu-ray Disc derives from the blue-violet laser used to read the disc. While a standard DVD uses a 650 nanometre red laser, Blu-ray uses a shorter wavelength, a 405 nm blue-violet laser, and allows for almost six times more data storage than a DVD.
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