Until recently Panasonic was our only choice for 50GB RW Blu-ray discs. Recently TDK started offering a 50 disc spindle of the 50GB rewritable format.
Blu-ray technology was developed to enable recording, rewriting and playback of high-definition video (HD), as well as storing large amounts of data. Blu-ray has more than five times the storage capacity of traditional DVDs and can hold up to 25GB on a single-layer disc and 50GB on a dual-layer disc.HD DVD media is compatible with HD DVD recording hardware only, while playback can be accessed through your HD DVD player or recording hardware.
 Blu-Ray Single Layer 25GB Write Once |  Blu-Ray Single Layer 25GB Rewritable |  Blu-Ray Dual Layer 50GB Write Once |  Blu-Ray Dual Layer 50GB Rewritable |
 Blu-ray Recorders / Duplicators | |