BD-50 replication: Blu ray triumph!! - High-Def Digest Forums
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Old 09-08-2007, 10:20 PM
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Default BD-50 replication: Blu ray triumph!!

Here is some more info from David Vaughn. He is an insider at AVS and a professional movie reveiw over at HTS:


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09-05-07 10:06 AM

Iíve received a lot of flack the past few days from people wanting me to reveal my sources in regard to the yield rates on both BD50ís and BD25ís. I will NOT list the company in order to protect the employee.

Here is where it all started. In doing HD DVD and BD reviews, talking to encoders helps A LOT in understanding how the process works. I have two such people that I have spoken to who have provided me with technical advice for quite some time. They are:

Independent DVD/HD DVD/BD Encoder who does work for both BD and HD DVD studios
Independent DVD/BD Encoder who does work for two BD studios
Also, a third source in this is a Studio Employee

The studio employee tipped me off that yields werenít up to what was being published so I asked the encoders if they had heard the same and they concurred. Both stated that when they were doing encodes on BD disc (single layer), they had to try and keep the total file system to under 23 GB because when they went over that data amount, yields dropped precipitously. So essentially a 25 GB disc was really only a 22-23 GB disc for it to be manufactured with any efficiency.

As for BD50 yields, the same applies with them as well when it comes to the data on the disc. They try and keep the data 10-15% below the max space (42-45 GB) for the same reasons, but the overall yields on the BD50ís werenít that good, but they couldnít supply actual numbers to me. So as with BD25ís, the actual space on BD50ís is in the neighborhood of 42-45GB, which is still a ton of data, but also isnít 50GB either.

In discussions with one of these encoders, they stated that Sony was originally doing all of the manufacturing of the BD discs for them because their normal supplier couldnít get yields above 10% on BD50ís since installing their lines.

So, with this information, I started to ask some more questions such as who is doing your manufacturing for you, do you know anyone I can talk to etc. Well, it turns out that one of the people was able to get me in contact with someone at a replication facility, so here is my next contact:

Employee at Independent replication facility

What he told me is that his company couldnít do the BD50ís above a 10% yield so all of their work was sent out to a third party company (independent as well) who could do the work. He let me know who this company was and it turned out that I was able to get a contact there. Which leads to my next contact:

Another Employee at separate Independent replication facility

This person goes on to tell me much of the same things that I have been hearing from those above, that yields are very low when a lot of data is on the disc (both BD25ís and BD50ís), but the average yields on BD25ís are in the 60-70% range, and at 50% for BD50ís. He then told me that Sony had helped them in their processing and that their yields were consistent with what Sony was getting in their facilities. He also stated that he knows that other facilities are having some serious issues because they receive BD images from other fabricators all the time to do their manufacturing of these discs for them.

Some new news to report on this though is that I was contacted last night by someone that just happens to work at the same facility as my last source above and that the BD25 numbers that were given to me were a bit low, and that 80% was more in line to what they are seeing today, but the BD50 number was accurate. He also confirmed that my information was correct when the disc is close to capacity that the yields drop fast because of the way the clear coat reacts around the edges of the discs.

Examining all of this in hindsight, I guess the only thing I would change would be stating the numbers given to me about Sonyís plants, since it came from only one person (second hand at that). But in light of what was sent to me last night, I think it is fair to say that if Sony states that are getting in the neighborhood of 85% yields, then I can take them at their word on that, at least on BD25ís. But based upon what my sources are telling me, they arenít 25 GB discs, they are more along the lines of 23GB discs.

Hopefully this placates any doubters out there as to the legitimacy of my sources.
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Old 09-08-2007, 10:26 PM
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Huh?
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Old 09-08-2007, 10:27 PM
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i fail to see the triumph in this ?
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Old 09-08-2007, 10:31 PM
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haha, I didn't understand a damn word, I am watching a movie in the background but haha, wtf.
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Old 09-08-2007, 10:41 PM
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Originally Posted by Riddick View Post
haha, I didn't understand a damn word, I am watching a movie in the background but haha, wtf.
The point is Blu ray BD-50 Gigabyte disks have yields that cannot be economically scaled up for the 4th Quarter of 2007.

The title is just saving time. I thought it would be a kind help to spin it for Blu ray before the dedicated supporters of that camp arrive....
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Old 09-09-2007, 12:13 AM
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So does this mean that a BD-25 actually only stores about 23gb of data while BD-50 stores somewhere about 25-30gb of data? I'm just trying to understand what I just read. Please let me know if this is right?

If true, this essentially means that there are major problems in producing Blu-rays and that getting 50gb out of Blu-ray is easier said than done. Right?
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Old 09-09-2007, 12:16 AM
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Quote:
Originally Posted by KoenigMKII View Post
The point is Blu ray BD-50 Gigabyte disks have yields that cannot be economically scaled up for the 4th Quarter of 2007.

The title is just saving time. I thought it would be a kind help to spin it for Blu ray before the dedicated supporters of that camp arrive....
Alright, I see now, thanks.
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Old 09-09-2007, 12:22 AM
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Quote:
Originally Posted by KoenigMKII View Post
The point is Blu ray BD-50 Gigabyte disks have yields that cannot be economically scaled up for the 4th Quarter of 2007.

The title is just saving time. I thought it would be a kind help to spin it for Blu ray before the dedicated supporters of that camp arrive....
How bought in even more lamens terms?
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Old 09-09-2007, 12:45 AM
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Ok I am a little confused by your use of the term Yields, do you mean to say that if they go over 23 GB then only 80% of the discs are good?

Or are you saying that they just cant get more than 23 GB onto a disc?
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Old 09-09-2007, 12:53 AM
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Quote:
Originally Posted by Sparrow View Post
Ok I am a little confused by your use of the term Yields, do you mean to say that if they go over 23 GB then only 80% of the discs are good?

Or are you saying that they just cant get more than 23 GB onto a disc?
Neither, if I understand correctly. It's more clear for the 50GB discs. From what it seems, single layer discs UNDER 23GB are good only 80% of the time. If discs go over, it drops much lower.
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