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Author Topic: c1 c2 ..r2d2  (Read 4010 times)

soundroid

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c1 c2 ..r2d2
« on: March 15, 2011, 10:39:36 pm »

Hi Chaps,

 I was just doing a routine check on some of my masters and I noticed I was getting c1 averages of 3.5.  I normally like to keep it under 3 and an average of 30.
So I called the local plant and asked them what their specs were for c1s and c2s on audio masters.
They basically said they'll pass  anything bar E32s.
Is this the same in the U.S and other countries?

Joe
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John Scrip - MASSIVE Mastering

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Re: c1 c2 ..r2d2
« Reply #1 on: March 16, 2011, 12:46:43 am »

Spec allows for an average of 220 C1 per second over any 1--second period (which is ridiculous and I'm sure you wouldn't send out such a disc - but that's what the spec allows). 

A single C2 and the disc gets thrown out here.  Although I understand it doesn't "need" to be.  But I wouldn't send a production master for my CD in if it had C2's, so I'm not sending anyone else's either.   
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John Scrip - MASSIVE Mastering

soundroid

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Re: c1 c2 ..r2d2
« Reply #2 on: March 16, 2011, 01:55:24 am »

thanks for that John.

I also meant to say that I was getting peaks, not averages of 30.
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SafeandSoundMastering

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Re: c1 c2 ..r2d2
« Reply #3 on: March 16, 2011, 05:12:08 am »

I tend to get 1.5 av per sec. at the moment with my current batch of disks and a Plextor 716A.

I am noticing that the drive produced slightly lower error rate disks if the PC has been running 2/3 hours which may suggest temperature if affecting the drive, though I am talking 3 vs 1.5 C1's av per sec here.
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Barry Gardner
SafeandSound Mastering UK based online mastering studio.

Jerry Tubb

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Re: c1 c2 ..r2d2
« Reply #4 on: March 16, 2011, 09:20:31 am »

0.5 avg/sec C1's here on the current batch of TY media on a NOS 716a.

Previous batch was more in that 1.5 range.

To me it's almost entirely dependent on the batch of discs, I often check the batch number on the inner band, keeping the best ones for masters, the others for refs.

JT

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Terra Nova Mastering
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Rick Sutton

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Re: c1 c2 ..r2d2
« Reply #5 on: March 16, 2011, 01:28:41 pm »

I've seen higher C1 since the Taiyo discs have been coming in under the JVC banner. Used to be in the .7 to 1.1 range and now run in the 1.5 to 3.0 range.
 Peaks are also following the higher trend.
Haven't seen any increase in C2 which is basically 0.

Sadie 5,  Plextor 760A
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Millice

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Re: c1 c2 ..r2d2
« Reply #6 on: March 16, 2011, 03:51:27 pm »

0.5 avg/sec C1's here on the current batch of TY media on a NOS 716a.

Previous batch was more in that 1.5 range.

To me it's almost entirely dependent on the batch of discs, I often check the batch number on the inner band, keeping the best ones for masters, the others for refs.

JT

Same here Jerry.  One spool will show consistent in the 0.3-0.5 avg/sec C1's and the next will show anywhere  from 1.5+ avg/sec C1's. 
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Dan Millice
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soundroid

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Re: c1 c2 ..r2d2
« Reply #7 on: March 16, 2011, 06:05:11 pm »

I've seen higher C1 since the Taiyo discs have been coming in under the JVC banner. Used to be in the .7 to 1.1 range and now run in the 1.5 to 3.0 range.
 Peaks are also following the higher trend.
Haven't seen any increase in C2 which is basically 0.

Sadie 5,  Plextor 760A

I noticed this too, hence my posting. I was getting 1 - 1.5 averages for a long time until recently. checked it on several burners with the same results. could possibly be the batch of TYs.
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Dave-G

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Re: c1 c2 ..r2d2
« Reply #8 on: March 16, 2011, 06:24:37 pm »

I'd echo what John said above;  C2 = coaster here on principle.

Also wanted to add that although the TY's I've had over the past year or so had been spottier than years past, the last several "JVC" branded TY watershield spindles I've gotten have been much better, and much more consistent in their low C1 averages.

-Dave
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Dave Greenberg
Sonopod Mastering

soundroid

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Re: c1 c2 ..r2d2
« Reply #9 on: March 17, 2011, 02:25:28 am »

I've rejected quite a few spindles lately with circular marks on the write-able side of the disc.
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jamesp

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Re: c1 c2 ..r2d2
« Reply #10 on: March 17, 2011, 10:12:07 am »

Spec allows for an average of 220 C1 per second over any 1--second period (which is ridiculous and I'm sure you wouldn't send out such a disc - but that's what the spec allows). 


It is also worth saying that Plextools only reports the number of error correction frames with errors so you could have an error correction frame with 2 errors which would still only show up as a single error in Plextools. That's why BLER rates from an Eclipse or Clover system are generally higher than the C1 rates shown by Plextools.

James.
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James Perrett - JRP Music
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SafeandSoundMastering

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Re: c1 c2 ..r2d2
« Reply #11 on: March 21, 2011, 05:32:37 am »

All the taiyo's I have bought over the last year or so have still not have JVC mentioned on them, I steer away if they have JVC written on them, they have JVC disks that are cheaper but I stick with what I know until I cannot anymore.
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Barry Gardner
SafeandSound Mastering UK based online mastering studio.

Jerry Tubb

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Re: c1 c2 ..r2d2
« Reply #12 on: March 21, 2011, 11:05:51 am »

We've bought a few TY spindles of 100, that had the JVC sticker on the outer wrapper, and they were just fine.

Not super-low errors, but certainly waaay within spec.

JT
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Terra Nova Mastering
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