
This is Part I in the spotanime.com multi-part series, “HD-DVD vs. Blu-ray: Consumers In The Crossfire,” dealing with the technology behind the two competing next-generation optical video formats.
The high definition wars are in full swing, and gamers and videophiles alike are caught in the crossfire. CES has come and gone, and the consensus is Blu-Ray winning the battle in the still-undecided war. With all the talk about studio neutrality, “will studio [X] support format [Y]“, and whatnot, it would be a good exercise to find out exactly how the format war got to this point, try to figure out why certain studios side with one format over another, and the future of high definition media.
The Shiny Disc: How It All Started
The best way to begin the story is to look at the origins of the original digital media, and it is interesting to see the similarities. Perhaps smarting from the VHS vs. Betamax format war of the late ’70s and early ’80s, Sony, partnering with Philips who had developed the , had a trump card in their back pocket with the Compact Disc (CD), the first optical digital format widely accepted by consumers. Building from the success of the CD, Sony positioned the format for the next great leap in consumer technology.
From the As far back as 1993, two working digital formats emerged – the MultiMedia Compact Disc (MMCD) developed by Philips and Sony based on their CD format, and the Super Density (SD) disc presented by bulk of major players in electronics and content – Toshiba, Time-Warner, Matsushita, Pioneer, JVC and others. What is known is that, in 1995, Sony threw the white flag in favor of the SD format, undoubtedly pressured by such a large support of the SD disc among its competitors, and the SD format remains largely unchanged as the current DVD format we all know today. Thus, the DVD Forum was born.
One single change to the format change made at the request of Sony/Philips is the Eight-to-Fourteen Modulation (EFM). In layman’s terms, Sony’s EFMPlus is basically the equivalent of a checksum bit in order to provide resilience against fingerprints and dust. It is also widely reported as being less efficient than Toshiba’s EFM specification, lowering the single-layer capacity of DVDs from 5GB to 4.7GB. One of the challenges of the optical video format was the resiliency to said fingerprints and dust at playback, thereby effecting the overall disc capacity. It is interesting to note, Sony’s main issue with the Blu-Ray format was because the data layer was so close to the surface of the disc that any anomalies would interfere with playback and disc performance. Thus, where they made concessions with capacity in favor of dependability, they seemed to have flipped their position with the Blu-Ray in order to gain a competitive advantage, albeit one with other implications.
Revenge is Best Served Blu
Sony and Philips made a nice profit on CD technology, but it was obvious they were not happy missing out on royalties to rival Toshiba. In bittersweet irony, Sony’s PS2 is widely attributed as the catalyst for mass acceptance of the DVD format, and because of this they quickly realized they would rather profit from both sides of the technology rather than one.
Sony immediately began working on a next optical format – the Professional Disc for Data (PDD). The PDD was a high-density optical disc utilizing a blue laser , paving the way for the Blu-Ray (BD) disc format. They both shared the same 405nm wavelength and 0.85 laser aperture, but where the PDD was primarily used for enterprise data archival and backup because of its use of higher-quality (and higher cost) media. This high-quality PDD media also allowed for faster transfer speeds in comparison to BD (88Mbit per second versus 36Mbit per second, respectively). One apparent compensation of the lower-cost media is to increase the capacity of the storage layers – PDD has a 23GB layer versus BD’s 25GB layer.
Sony, not wanting to lose again to a rival technology, decided it would circumvent the DVD Forum altogether by creating its own group, the Blu-Ray Disc Association, thereby backing the BD as a rival format to HD-DVD.
Toshiba, in order to preserve their position in the DVD Forum, entered the race with their own next-generation optical format, the Advanced Optical Disc (AOD). The AOD used the same 405nm wavelength but differed with a 0.65 laser aperture, resulting in a lower-capacity disc layer. This format was later adopted by the DVD Forum and renamed HD-DVD.
The difference in aperture makes it incompatible with BD, but also has an impact on another key factor: surface layer. Toshiba kept the HD-DVD specification the same as current DVDs – 0.6mm, which is why HD-DVDs can be manufactured at the same plants as standard DVDs. BD, meanwhile, requires a smaller 0.1mm surface layer to compensate for the 0.85 laser aperture. Data closer to the disc’s surface means more data layers, which in turn means a higher capacity disc. However, as mentioned earlier, because data resides so close to the disc’s surface, a special hard coating technology was invented by TDK called Durabis. This all means increased manufacturing costs for BD and separate replication plants between HD-DVD/DVD and BD.
Drawing a Line in the Disc
If one were to compare BD and HD-DVD on paper, they would find more similarities than differences. They both offer lossless audio and 1080p high-definition video via the same video codecs, meaning they basically both provide the same home theater experience, granted the consumer has the hardware to support it.
The differences in capacity are negligible, given the audio and video codecs available. But the rule of storage has always been more is better, regardless of current need. With BD currently supporting 50GB, and the ability to add more data layers as well as increase capacity of current layers, BD gets the nod here. But where BD is showing off its 50GB discs with MPEG-4, HD-DVD has been utilizing the VC-1 codec, which offers the same quality at generally half the file size. VC-1 is better for HD-DVD because of its lower disc capacity, and neutral studios have been using single VC-1 masters across BD and HD-DVD product releases. Thus, a VC-1 master on HD-DVD is the same quality as a VC-1 master on BD, regardless of capacity. And it can be said a VC-1 master on HD-DVD is of comparable quality to an MPEG-4 master on BD, despite the larger file size of the latter.
Interactivity has always been a major selling point of the new formats, regardless of whether people will actually use them or not. HD-DVD has iHD, which has been put to good use on early releases like Batman Begins and Fast and the Furious: Tokyo Drift. BD-J is Java-based, and although it provides the potential for interactivity with Video on Demand and interactive television content, it has been more difficult to implement. Although iHD has the early lead, the jury is out whether BD-J can live up to the hype.
DRM is where the two sides really start to separate. Both support Advanced Access Content System (AACS), and both formats have already been hacked. But BD, under pressure from Hollywood studios, came up with a secondary protection method built upon AACS called BD+, which through an internet connection can dynamically change license keys for titles in the event a disc has been compromised. And a third protection scheme, ROM-Mark, is a watermark used to prevent unlawful replication of BD discs. It is considered these extra copy protection schemes were the reason why FOX decided to back BD exclusively.
But as much protection BD+ and ROM-Mark offer studios, there is a fair amount of concern regarding how these can negatively impact consumers. Specifically, the concern is around Mandatory Managed Copy, which is the ability for users to make a digital copy of their disc to a PC or other video device. Some say BD+ won’t allow for this, but since no BD+ discs have been released, it remains to be seen how it will be implemented. With HD-DVD, people are misreading Mandatory Managed Copy as a “free” copy for the consumer, which is not always true and is up to the studio’s discretion whether they charge for it or not.
Where BD’s DRM has Hollywood’s favor, manufacturing costs surely have the studio accountant’s attention. According to a September 26, 2005 article in Ars Technica, the cost of upgrading manufacturing lines for BD is ten times that HD-DVD, and a potential total investment of nearly a billion dollars globally.
Comparing the two formats, each has their positives and negatives, but when weighed against each other as a whole they are comparable. The real reason why the format wars exist in the first place are entirely political, and all this bickering and fighting are for a stopgap physical media which only exists until digital distribution becomes more widely available.
Please check back soon for the next part in the series, “HD-DVD vs. Blu-ray: Consumers In The Crossfire .”
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