Storage capacity and speeds One single-layer Blu-ray Disc (BD) can hold about 25
GB or over two hours of HD video plus audio, and the dual-layer disc can hold approximately 50 GB. The data transfer rate is 36
Mbit/s (54 Mbit/s for BD-ROM), but 2x speed prototypes with a 72 Mbit/s transfer rate are now in development. The BD-RE (rewritable) standard is now available, to be followed by the BD-R (recordable) and
BD-ROM formats in mid-2004, as part of version 2.0 of the Blu-ray specifications. BD-ROM pre-recorded media are to be available by late
2005. Blu-ray Discs with capacities of 100 GB and 200 GB are currently being researched, with these capacities achieved by using four and eight layers respectively. On
May 19,
2005,
TDK announced a prototype four-layer 100 GB Blu-ray disc.
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