Assist 12G problem recording SSD T7

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martin77bg

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Assist 12G problem recording SSD T7

PostThu May 14, 2020 9:04 pm

Hello, week ago I bought BM assist 12G 5”,I have SSD T7 Samsung but it cannot start recording.
It starts and stops, red (!) is blinking. Does someone knows what is the reason for that ? The firmware is 3.1
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Denny Smith

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Re: Assist 12G problem recording SSD T7

PostFri May 15, 2020 5:16 am

Yes, you are dropping frames. What is,your camera and what resolutions and frame rate Aare you trying to record at? Is your drive on the BMD approved list?
Cheers
Denny Smith
SHA Productions
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martin77bg

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Re: Assist 12G problem recording SSD T7

PostFri May 15, 2020 7:54 am

My camera is sony A7rIII I trying recording full HD but again stop recording:(
With SD cards no problem working correctly!
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Denny Smith

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Re: Assist 12G problem recording SSD T7

PostSat May 16, 2020 12:27 am

That is 4K/UHD 2160p showing on the display, HD is 1080p. Your Samsung T7 dive isn’t not on the BMD list of recommended/tested drives. The only Samsung Portable SSD on the list is the T5, 1TB drive.
See BMD Support: https://www.blackmagicdesign.com/support/faq/59028.

So the drive you have is unable to record fast enough to keep up with video signal from the VA, and is dropping frames, which gives you the blinking light. You also have the VA set to stop recording when it detects dropped frames.
Cheers
Denny Smith
SHA Productions
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martin77bg

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Re: Assist 12G problem recording SSD T7

PostSat May 16, 2020 2:02 pm

This is ridiculous, T7 is inheritor of T5, and the speed is too times faster! How it's possible T5 not to have a problem with the recording, and T7 not supporting it?!
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Denny Smith

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Re: Assist 12G problem recording SSD T7

PostMon May 18, 2020 5:58 pm

OK, now your signal is HD/1080p59.94, which is still going to require a faster write speed card than 1080p29.94, as the faster the frame rate, the higher the bandwidth.

Samsung T7 and T5 are entirely different SD cards. Video uses continuous write speeds, not packet write speeds used by computers, so not all cards are created equal. SanDisk had this same issue with the UHS1 Extreme Pro cards, when updated, no longer worked in BMD cameras.
Cheers
Denny Smith
SHA Productions
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martin77bg

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Re: Assist 12G problem recording SSD T7

PostMon May 18, 2020 7:25 pm

Thanks for your time to answer me, I appreciate this,but I think this is not the case T5 and T7 are SSD no SD.
I tried even to record 1080p 24fps,but again it's not working. Is someone from the BlackMagic developers answering questions here?
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Denny Smith

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Re: Assist 12G problem recording SSD T7

PostMon May 18, 2020 8:05 pm

I know they are SSDs, but they work in a very similar way, with a firmware that controls how they record data. BMD cameras are more picky with SSDs than they are SD cards. SSDs were designed as computer recording media, and record data in packets. How they record determines if they will work for recording camera video stream, which is continuous, and not in packets. Most SSDs have some type of buffer memory that sores the incoming signal while the card writes out its packets of data. How the SSD handles this, determine of it will work for video.

Bottom line, is you need to use the SSD media, tested and recommend by BMD.
Cheers
Denny Smith
SHA Productions
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Tony Rivera

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Re: Assist 12G problem recording SSD T7

PostTue May 19, 2020 6:07 pm

As Denny has stated multiple times in the thread, this is not on the approved media list and be aware that this disk has a USB 3.2 Gen2 (10Gb/s) interface. The Video Assist 12G is USB Type-C 3.1 Gen 1 (5GB/s).
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