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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: 0) by Anonymous Coward on Saturday November 17 2018, @11:23AM

    by Anonymous Coward on Saturday November 17 2018, @11:23AM (#763043)

    Verbatim is now a sub-brand of them if I remember correctly, and they worked out an exclusive deal to market and produce the m-discs for Millenata.

    I have a couple of their discs, and for important old code, photos, etc they can't be beat. However I've switched to JVC/Optima 50 packs of 25GB BD-Rs which provide much more capacity per dollar. But even then I am finding it more sensible to just buy 1-4TB hard disks which can transfer data in a matter of minutes that will take a half hour or longer to burn, and restrict my burned media to stuff I am worried about getting accidentally deleted or corrupted on the hard disk. Just given dry weather and 50F-100F storage temperatures I've got drives that have lasted 10-30 years with minimal data loss (some even that had partial head failures in the 1990s which I just read off in the past few years once testdisk/photorec/dd_rescue got good enough. Given that, the odds are good that the hard disk will be just as recoverable in 20+ years as the BD-Rs will.