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Blu-ray Disc recordable (or BD-R) refers to two optical disc formats that can be recorded with an optical disc recorder. BD-R discs can be written to once, whereas BD-RE can be erased and re-recorded multiple times. Disc capacities are 25 GB (23.31 GiB) for single layer discs and 50 GB (46.61 GiB) for double layer discs.[1]
As of September 2009[update], BD-R/RE drives up to 8x are sold for about US$150[2] and 2x single-layer BD-R discs with a capacity of 25 GB can be found for US$3-$5[3].
Contents |
Version
BD-RE Versions
There are three versions of rewritable Blu-ray Discs (BD-RE):[4]
Version 1.0
- unique BD File System
- not computer compatible
Version 2.0
Version 3.0
- camcorder (8 cm) discs added
- backward compatible with Version 2.0
- BD-R Version 2.0 follows this specification
BD-R Versions
Version 1.2
- add BD-R Low To High (BD-R LTH) standard.[5]
Speed
| Drive speed | Data rate | BD-R write time | BD-R DL write time | ||
|---|---|---|---|---|---|
| 1X[1] | 36 Mbit/s | 4.5 MB/s | 4.39 MiB/s | ~95 min. | ~190 min. |
| 2X | 72 Mbit/s | 9 MB/s | 8.78 MiB/s | ~47 min. | ~94 min. |
| 4X | 144 Mbit/s | 18 MB/s | 17.56 MiB/s | ~24 min. | ~48 min. |
| 6X | 216 Mbit/s | 27 MB/s | 26.34 MiB/s | ~16 min. | ~32 min. |
| 8X | 288 Mbit/s | 36 MB/s | 35.12 MiB/s | ~12 min. | ~24 min. |
| 12X | 432 Mbit/s | 54 MB/s | 52.63 MiB/s | ~8 min. | ~16 min. |
BD-R LTH (Low To High)
BD-R LTH is a write-once Blu-ray disc format that features an organic dye recording layer. The advantage of BD-R LTH is it can protect a manufacturer's investment in DVD-R/CD-R manufacturing equipment. Only modifications are required to current equipment; no investment in new production lines is required. It is believed this can lower the cost of discs. [6]
Old Blu-ray players and recorders can't utilize BD-R LTH, however, a firmware upgrade could enable the device to access BD-R LTH. Panasonic has already released such a firmware update in November 2007 for its DMR-BW200, DMR-BR100 and the MR-BW900/BW800/BW700 models. [7] Pioneer is also expected to ship the first LTH BD drives in Spring of 2008[8]. Furthermore, Sony's PlayStation 3 received firmware upgrade to enable BD-R LTH reading in March, 2008[9].
See also
References
- ^ a b blu-ray.com
- ^ http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&SubCategory=600&N=2010100600&SpeTabStoreType=1
- ^ http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=2010100071%201087422108&name=BD-R
- ^ blu-raydisc.info
- ^ LTH was included in the "Blu-ray Disc Recordable Format Ver.1.2" specifications. cdrinfo.com
- ^ Pioneer and Mitsubishi Develop Low cost BD-R Discs Using Organic Recording Layerscdrinfo.com
- ^ Firmware Adds Support for LTH BD-R Discs to Panasonic Recorderscdrinfo.com
- ^ Taiyo Yuden, Mitsubishi and Maxell Release First LTH BD-R Discscdrinfo.com
- ^ PS3 firmware update v2.20 available -- added support for LTH BD-Rafterdawn.com
External links
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