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posted by martyb on Saturday November 10 2018, @09:34PM   Printer-friendly
from the Better-than-NAND? dept.

Sony Releases Quad-Layer 128 GB BD-R XL Media

Sony is about to start selling the industry's first 128 GB write-once BD-R XL optical media. The discs will also be the first quad-layer BDXL media formally aimed at consumers, but bringing benefits to professionals that use BDXL today.

Although the general BDXL specifications were announced back in 2010 for multi-layered write-once discs with 25 GB and 33.4 GB layers, only triple-layer BDXL discs with a 100 GB capacity (generally aimed at broadcasting, medical, and document imaging industries) have been made available so far. By contrast, quad-layer 128 GB media has never seen the light of day until now.

As it turns out, increasing the per-layer capacity of Blu-ray discs (BDs) to 33.4 GB via a technology called MLSE (Maximum Likelihood Sequence Estimation) was not a big problem, and most of today's BD players and optical drives support the BDXL standard. However, increasing the layer count to four while ensuring a broad compatibility, signal quality across four layers, yields, and some other factors slow downed release of 128 GB BDXL essentially by eight years.

Related: Ultra HD Blu-Ray Specification Completed


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  • (Score: 3, Informative) by deimtee on Sunday November 11 2018, @12:47PM

    by deimtee (3272) on Sunday November 11 2018, @12:47PM (#760628) Journal

    My stamped music CDs from the 80's and 90's all still play fine. I have some burnt Kodak Gold CDs that are over 15 years old that still play.
    Cheap disks I burnt for the car or got from friends don't do so well. Some of those have delaminated within a couple of years.

    --
    No problem is insoluble, but at Ksp = 2.943×10−25 Mercury Sulphide comes close.
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