CRC test after copy at DVinfo.net

Robin Probyn · May 4th, 2012, 10:05 AM

Notice in XDCAM browser option for CRC test.. what is that testing? how much extra would that add to the down load time..

Getting very fast down load with 17inch mac express port,to ext HDD firewire 800.Just over 6 mins for full 32GB SXS 1 cards.XDCAM 422 UDF 1080/25p !!

Dave Morrison · May 4th, 2012, 09:32 PM

It's making sure that you got a bit-for-bit accurate copy of your BPAV folder and files. Absolutely turn this on and use it.

Steve Kalle · May 14th, 2012, 02:14 PM

I agree 100%. Also, check the box for 'Data Protection'. The CRC check happens after the copy is made and usually takes 15 seconds or less depending on how much data.

Some people are naive and think nothing bad will ever happen to them. If your living depends on this footage, then be safe and minimize your risk. I have experienced corruption from a simple copy & paste 2 times and once from faulty ram, which is another reason why backups are crucial. After the recent 2 corruptions, I always do a quick check in XDCAM Browser of my 2 backups. Checking that the number of bits/bytes is the same is not an accurate method because all 3 corruptions had an identical # of bits. If a clip is damaged, XDCAM Browser will not show that clip so its as simple as comparing the top and bottom windows for the same # of clips.

Robin Probyn · May 14th, 2012, 08:05 PM

Thanks Steve

I found the CRC check doubled the down load time for 50mbps UDF 32 GB card.. but still approx 12 mins from 6 mins is still pretty good.How does the protect data function actually work.

Thanks

Robin

May 4th, 2012, 10:05 AM	#1
Robin Probyn Major Player Join Date: Jan 2010 Location: Tokyo Posts: 590	CRC test after copy Notice in XDCAM browser option for CRC test.. what is that testing? how much extra would that add to the down load time.. Getting very fast down load with 17inch mac express port,to ext HDD firewire 800.Just over 6 mins for full 32GB SXS 1 cards.XDCAM 422 UDF 1080/25p !!

May 4th, 2012, 09:32 PM	#2
Dave Morrison Major Player Join Date: May 2002 Location: West Central Florida Posts: 762	Re: CRC test after copy It's making sure that you got a bit-for-bit accurate copy of your BPAV folder and files. Absolutely turn this on and use it. __________________ EX1, Nikon D750 http://www.morrisonphotographics.com http://www.heritagefilm.com

May 14th, 2012, 02:14 PM	#3
Steve Kalle Trustee Join Date: Aug 2009 Location: Chicago, IL Posts: 1,554	Re: CRC test after copy I agree 100%. Also, check the box for 'Data Protection'. The CRC check happens after the copy is made and usually takes 15 seconds or less depending on how much data. Some people are naive and think nothing bad will ever happen to them. If your living depends on this footage, then be safe and minimize your risk. I have experienced corruption from a simple copy & paste 2 times and once from faulty ram, which is another reason why backups are crucial. After the recent 2 corruptions, I always do a quick check in XDCAM Browser of my 2 backups. Checking that the number of bits/bytes is the same is not an accurate method because all 3 corruptions had an identical # of bits. If a clip is damaged, XDCAM Browser will not show that clip so its as simple as comparing the top and bottom windows for the same # of clips.

May 14th, 2012, 08:05 PM	#4
Robin Probyn Major Player Join Date: Jan 2010 Location: Tokyo Posts: 590	Re: CRC test after copy Thanks Steve I found the CRC check doubled the down load time for 50mbps UDF 32 GB card.. but still approx 12 mins from 6 mins is still pretty good.How does the protect data function actually work. Thanks Robin