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 Post subject: Help identifying disc manufacturer
PostPosted: 10 Jun 2018, 20:39 
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I've had this P&S copy of Johnny Handsome for ages but when I had a look at the mint markings it was unlike any that I'd seen before. At first I thought it might be a Laservideo/Disctronics disc but the mint marking clearly indicate its a Sony disc, however it lacks the bar code and other markings so I assume it must be an early DADC USA disc. Additionally the edge is very sharp unlike all other DADC discs I've seen. Has anyone seen one like this before? Image
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 Post subject: Re: Help identifying disc manufacturer
PostPosted: 10 Jun 2018, 23:15 
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Hello!

Giving us the exact release details as well as a picture of the actual mint marks would surely help!

https://www.lddb.com/search/IMDb/0097626

Julien
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 Post subject: Re: Help identifying disc manufacturer
PostPosted: 10 Jun 2018, 23:21 
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I did put a link to an image, is it not showing up? Here's another one: https://imgur.com/a/OJt3OyT The disc is ID7313IV, 1990. Sorry I could have done a better job with the original post.
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 Post subject: Re: Help identifying disc manufacturer
PostPosted: 11 Jun 2018, 02:32 
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kid_dynamo wrote:
I did put a link to an image, is it not showing up? Here's another one: https://imgur.com/a/OJt3OyT The disc is ID7313IV, 1990. Sorry I could have done a better job with the original post.


VERY early DADC/Sony USA. Back when their stuff didn't rot.
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 Post subject: Re: Help identifying disc manufacturer
PostPosted: 11 Jun 2018, 22:28 
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blam1 wrote:
kid_dynamo wrote:
I did put a link to an image, is it not showing up? Here's another one: https://imgur.com/a/OJt3OyT The disc is ID7313IV, 1990. Sorry I could have done a better job with the original post.


VERY early DADC/Sony USA. Back when their stuff didn't rot.


Is that so, I didn't realize they started having problems later on. I'm not overly familiar with DADC USA as I've largely managed to avoid them aside from a few discs I picked up very early on and some IMAX titles. I realize disc rot is not well understood but I'd be interested to know exactly what they were doing that gave them such a high defect rate. My understanding is that rot has different causes as with DADC discs the disc itself almost always looks fine but with PDO UK and some 3M, Mitsubishi and Discovision discs you can clearly see degradation of the reflective layer.
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 Post subject: Re: Help identifying disc manufacturer
PostPosted: 11 Jun 2018, 22:57 
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kid_dynamo wrote:
blam1 wrote:
kid_dynamo wrote:
I did put a link to an image, is it not showing up? Here's another one: https://imgur.com/a/OJt3OyT The disc is ID7313IV, 1990. Sorry I could have done a better job with the original post.


VERY early DADC/Sony USA. Back when their stuff didn't rot.


Is that so, I didn't realize they started having problems later on. I'm not overly familiar with DADC USA as I've largely managed to avoid them aside from a few discs I picked up very early on and some IMAX titles. I realize disc rot is not well understood but I'd be interested to know exactly what they were doing that gave them such a high defect rate. My understanding is that rot has different causes as with DADC discs the disc itself almost always looks fine but with PDO UK and some 3M, Mitsubishi and Discovision discs you can clearly see degradation of the reflective layer.


Hi kid_dynamo,

Yes, it's true. When all of the other manufacturing plants were getting better, Sony DADC USA was actually getting worse :crazy: ! This seems to have happened sometime in 1995. The best way to tell which ones to avoid is to watch the "LDVS-" numbers in the mint markings. The higher the number, the more likely that the disc will have rot. I have heard that a good rule of thumb is any disc with a number of 2700 or higher in the mint markings is a high risk for laser rot. The ones with very low numbers, from 1992, 1993, etc. very rarely have rot problems. I don't know exactly what happened at the Sony DADC USA plant, but I have a theory. The problems seem to have gotten much worse there after they got the big contract to mass produce discs for Columbia Tristar. I believe they simply got in over their heads during this period and let their quality control procedures fall by the wayside. Columbia Tristar was sending them so much work that they just couldn't keep up and they got very sloppy. They probably let the "clean room" production standards slip really badly in order to keep up with the massive workload, and it showed in their finished products. Only someone who actually worked in the plant during that time could say for certain, but that's my theory. It's possible that they also could have changed something in the glue and/or other raw materials they were using during that time.

Best Regards,
David
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 Post subject: Re: Help identifying disc manufacturer
PostPosted: 11 Jun 2018, 23:55 
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That certainly sounds probable, as I understand 3M suffered from a similar problem several years before that when they were just being pushed beyond their capabilities to maintain quality control. Though 3M and later Imation were able to recover it seems Sony USA didn't have the time and/or inclination. :(
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 Post subject: Re: Help identifying disc manufacturer
PostPosted: 12 Jun 2018, 13:14 
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kid_dynamo wrote:
Is that so, I didn't realize they started having problems later on.


It's quite obvious if you sort the number of times a LD was reported as a rotter by the chronological, master serial number SONY used:

https://www.lddb.com/dadc.php

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