Friday, December 14, 2007

Blu-ray Disc Recordable

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. As of March 2007, BD-R/RE drives up to 4x retail are sold for about $600 and 2x single-layer BD-R discs, with a capacity of 25 GB, can be found for around $12. 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.


There are three versions of recordable Blu-ray Discs:[1]

Version 1.1

  • hard coating requirement added
  • recording rate 1-2x
  • file system: UDF 2.6
  • the use of AACS

Version 1.2

  • backward compatible with Version 1.1

Version 2.0


Drive speed Data rate Write time for Single Layer BD
1X 36 Mbit/s 4.5 MB/s 95 min.
2X 72 Mbit/s 9 MB/s 47 min.
4X 144 Mbit/s 18 MB/s 24 min.
8X 288 Mbit/s 36 MB/s 12 min.
12X 432 Mbit/s 54 MB/s 8 min.

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