Blu-ray Disc recordable

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Optical disc authoring v • d • e
Optical disc Optical disc image Optical disc drive Optical disc authoring Authoring software Recording technologies Recording modes Packet writing
Optical media types
Laserdisc (LD), Video Single Disc (VSD) Compact Disc (CD): Red Book, 5.1 Music Disc, SACD, PhotoCD, CD-R, CD-ROM, CD-RW, CD Video (CDV), Video CD (VCD), SVCD, CD+G, CD-Text, CD-ROM XA, CD-i MiniDisc (MD) (Hi-MD) DVD: DVD-R, DVD+R, DVD-R DL, DVD+R DL, DVD-RW, DVD+RW, DVD-RW DL, DVD+RW DL, DVD-RAM, DVD-D Ultra Density Optical (UDO) Universal Media Disc (UMD) HD DVD: HD DVD-R, HD DVD-RW, HD DVD-RAM, HD DVD-ROM Blu-ray Disc (BD): BD-R, BD-RE
Standards
Rainbow Books File systems ISO 9660 Joliet Rock Ridge El Torito Apple ISO 9660 Extensions Universal Disk Format (ISO 9660) (UDF) Mount Rainier
Further reading
History of optical storage media High definition optical disc format war

Blu-ray Disc recordable 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 25GB (23.31 GiB) for single layer discs and 50GB (46.61 GiB) for dual layer discs.^[1]

As of January 2008, BD-R/RE drives up to 6x are sold for about US$400 and 2x single-layer BD-R discs^[2] with a capacity of 25 GB can be found for US$10. The theoretical maximum for Blu-ray Discs is about 12x, as the speed of rotation (10,000 rpm) causes too much wobble for the discs to be read properly. This is similar to the 20x and 52x respective maximum speeds of DVDs and CDs.

Contents 1 Version 1.1 BD-RE Versions 1.2 BD-R Versions 2 Speed 3 BD-R LTH (Low To High) 4 See also 5 References 6 External links

[edit] Version

[edit] BD-RE Versions

There are three versions of rewritable Blu-ray Discs (BD-RE):^[3]

Version 1.0

• unique BD File System
• not computer compatible

Version 2.0

• UDF 2.5 file system for computer use
• the use of AACS
• BD-R Version 1.0 follows this specification

Version 3.0

• camcorder (8 cm) discs added
• backward compatible with Version 2.0
• BD-R Version 2.0 follows this specification

[edit] BD-R Versions

Version 1.2

• add BD-R Low To High (BD-R LTH) standard.^[4]

[edit] Speed

Drive speed	Data rate		Single layer BD write time
1X[1]	36 Mbit/s	4.5 MiB/s	95 min.
2X	72 Mbit/s	9 MiB/s	47 min.
4X	144 Mbit/s	18 MiB/s	24 min.
6X	216 Mbit/s	27 MiB/s	16 min.
8X	288 Mbit/s	36 MiB/s	12 min.
12X	432 Mbit/s	54 MiB/s	8 min.

[edit] BD-R LTH (Low To High)

BD-R LTH is a write-once Blu-ray disc format that features 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. ^[5]

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 last November for its for its DMR-BW200, DMR-BR100 and the MR-BW900/BW800/BW700 models. ^[6] Pioneer is also expected to ship the first LTH BD drives in Spring of 2008^[7]. Furthermore, Sony's Playstation 3 received firmware upgrade to enable BD-R LTH reading in March, 2008^[8].

[edit] See also

• Optical_disc_authoring#Blu-ray_Disc
• Optical Disc

[edit] References

[edit] External links

v • d • e High definition media Media formats Blu-ray Disc · HD DVD Promoter Blu-ray Disc Association · HD DVD Promotion Group Interactivity BD-Java · HDi Recordable formats BD-R • BD-RE · HD DVD-R · HD DVD-RW  · HD DVD-RAM Comparison Comparison of high definition optical disc formats Copy protection AACS (both)  · HDCP (both)  · BD+ (BD)  · ROM-Mark (BD) Blu-ray Disc players PlayStation 3 · Sony BDP-S1 · Panasonic DMP-BD10 HD DVD players Xbox 360 HD DVD Drive · Toshiba HD-A1 · Toshiba HD-XA1