Sony Electronics has begun shipping its 25GB single layer Blu-ray Disc recording media with AccuCORE technology. In addition, a dual layer 50GB capacity disc is set to debut in June. The discs support a 2x recording speed adding up to 72 Mbps, or 9 MB/s. While this transfer rate would allow a 4.7 GB DVD±R disc to be burned in about nine minutes, it will theoretically force users to wait over an hour and a half to fill a 50 GB Blu-ray disc and just over 45 minutes for a 25 GB single-layer disc. Cutting down burn times to 10 minutes for a 50 GB disc would require a constant 83 MB/s transfer rate, something that most consumer-level hard drives would have a hard time achieving.  The BD-R (write-once) 25GB and BD-RE (rewritable) 25GB recording media have suggested retail prices of $20 and $25, respectively. The soon to come BD-R 50GB and BD-RE 50GB recording media will have suggested retail prices of $48 and $60, respectively.