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.

In a bid to build a viable quad-layer 128 GB write-once BDXL disc, Sony had to design three new materials. First, the company had to create a new recording alloy that would provide the right combination of reflectance and transmittance to ensure that the layers can “reflect” data bits when needed while allowing the 405nm laser to pass through them when another layer is accessed. Then, Sony had to develop a new inter-layer material (called dielectric) that would also be able to transmit light waves. Finally, because with four layers the first one has to be located closer to the disc’s surface, Sony had to design a new protective coating for the media.

Sony will start shipments of its BD-R XL 128 GB media on the 10th of November. Single-disc packages (BNR4VAPJ4) will retail for ¥1,500 ($13), a pack of three (3BNR4VAPS4) will cost ¥3,900 ($34), whereas a pack of five (5BNR4VAPS4) will be priced at ¥6,000 ($53). The discs should be compatible with drives supporting the BDXL spec, though a firmware update may be needed regardless.

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Sources: Sony, PC Watch,

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  • PeachNCream - Friday, November 09, 2018 - link

    Interesting, but the market for write-capable optical media is probably not as big as it was when the first CD-Rs were released since there are lots of other options for high capacity "sneaker-net" storage around. Reply
  • edzieba - Saturday, November 10, 2018 - link

    It's getting a decent amount of interest for medium-term (i.e. non-archival) cold-stoarge, as you can grab a specific file from an optic disc far more quickly than you can spool along a tape, even with the added delay of loading the drives. Reply
  • Tams80 - Saturday, November 10, 2018 - link

    Not as big, but CDs were THE format back then. There's still a sizeable market, albeit much smaller. Optical storage also has price on its side (just) and for long term storage is much more reliable. Reply
  • frenchy_2001 - Wednesday, November 14, 2018 - link

    They are only 50% of the price of a 128GB MicroSD.
    write once vs write many
    bad access time vs flash
    not sure about read/write bandwidth, but the SD is no slouch there either...
    not sure which one retains data better (burnable CDs/DVDs were actually pretty bad, most of them with an expected shelf life after burn of ~5 years top if kept in a dark and dry environment)
    Reply
  • iwod - Friday, November 09, 2018 - link

    Were there any PS4 / Pro Games that ever needed two BD? i.e 50GB ( Assuming all PS4 BD are 25GB )? Reply
  • DigitalFreak - Friday, November 09, 2018 - link

    Red Dead Redemption 2 is 2 discs Reply
  • yeeeeman - Friday, November 09, 2018 - link

    Red dead redemption 2 comes with 2 BD dual layer disks, each 50GB in size. Reply
  • Lolimaster - Friday, November 09, 2018 - link

    You will need to install it anyways. Reply
  • nikon133 - Sunday, November 11, 2018 - link

    True... and only one disk is required for playing, so no swapping.

    Still... with all the future PS and X being - they should, right? - proper 4K machines, amount of data will raise further. textures, pre-rendered cut scenes and whatnot. There will always be requirement for more storage.
    Reply
  • TEAMSWITCHER - Friday, November 09, 2018 - link

    If only there was a world wide network of computers, that allowed you to download a massive amount of data as you needed it. Reply

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