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Enthusiast
Posts: 6
Registered: β€Ž07-26-2017
Message 1 of 11 (1,903 Views)
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Micro SD card to get πŸ’― Mbps 4k?

I found a Samsung card that has 100 read speed and 90 write speed. Would that be sufficient to take advantage of the 100 Mbps 4k recording or do I need a card that has a wrote speed of at least a 100?

Thanks
Enthusiast
Posts: 6
Registered: β€Ž07-26-2017
Message 2 of 11 (1,899 Views)

Re: Micro SD card to get πŸ’― Mbps 4k?

This is the card I was looking at
Pro+ 64GB microSDXC UHS-I Memory Card
Up to 100MB/sec. read speed
Along with an up to 90MB/sec. write speed

http://m.ebay.com/itm/Samsung-Pro-64GB-microSDXC-UHS-I-Memory-Card-Black-white-/192218769051

Expert
Posts: 297
Registered: β€Ž02-03-2016
Message 3 of 11 (1,889 Views)

Re: Micro SD card to get πŸ’― Mbps 4k?

Enthusiast
Posts: 6
Registered: β€Ž07-26-2017
Message 4 of 11 (1,857 Views)

Re: Micro SD card to get πŸ’― Mbps 4k?

And it's done the highest recording setting no problem with it? I was looking at this card as well, the local beat buy just had a deal on the one I posted. As far I can tell (I could be wrong). But they both have similar stats...100 read 90 write. If it works for you then the other should do the job as well I imagine.
Expert
Posts: 297
Registered: β€Ž02-03-2016
Message 5 of 11 (1,849 Views)

Re: Micro SD card to get πŸ’― Mbps 4k?

Yes; max camera speed.

 

Most cards do not work in these cameras, regardless of what their speed ratings are. This is because the camera doesn't do much buffering and needs a high burst speed. Whereas if e.g. you shot a video on an android phone, 100mbps 4K, you could use the cheapest 200GB card...

Expert
Posts: 1,047
Registered: β€Ž11-02-2015
Message 6 of 11 (1,846 Views)

Re: Micro SD card to get πŸ’― Mbps 4k?

90 write mostly means 90MB/s, which is 720 Mbit/s.

Don't confuse MB/s and Mbit/s.

I highly recommend to visit the "SonyActionCam" subreddit, since there is a list of working SD cards in the sidebar.
Expert
Posts: 85
Registered: β€Ž05-27-2017
Message 7 of 11 (1,800 Views)

Re: Micro SD card to get πŸ’― Mbps 4k?

I use the Samsung 256 also.
Expert
Posts: 1,047
Registered: β€Ž11-02-2015
Message 8 of 11 (1,763 Views)

Re: Micro SD card to get πŸ’― Mbps 4k?


peterh337 wrote:

Whereas if e.g. you shot a video on an android phone, 100mbps 4K, you could use the cheapest 200GB card...


That is not even true. Video cameras do not buffer. Photo cameras do.

 

For video recordings the "buffer" would run full eventually - as soon as this happens you would run into the problem of the recording suddendly stopping or becoming completly corrupted from the point the buffer is full and the video needs to write to the card directly.

 

 

 

Expert
Posts: 297
Registered: β€Ž02-03-2016
Message 9 of 11 (1,686 Views)

Re: Micro SD card to get πŸ’― Mbps 4k?

You didn't understand what I was saying about buffering.

 

100mbps is about 12 megabytes/sec. Yet, most SD cards specified way above that figure still don't work in these cameras.

 

Go-Pro etc have the same problem. I reckon all these action cams are based on some development kit, with some crude software, released by Sony to get people to quickly develop hardware around their sensors.

Expert
Posts: 1,047
Registered: β€Ž11-02-2015
Message 10 of 11 (1,679 Views)

Re: Micro SD card to get πŸ’― Mbps 4k?

[ Edited ]

Yeah, 100Mbit/s = 12.5 MB/s, I get that.

Though I am certain it is not the cameras fault, yet the SD cards fault.

The "write" speed which is stated on the packaging/spec page is mostly the "maximum", not the "lowest" write speed the card eventually settles down to.

I could do hours of card benchmarking to find out the real number, yet I don't think it is worth my time - I rather try a card - if it works - ok, if not - send it back and buy one of the cards other users confirmed to work.

 

Also - as far as I am informed - GoPro only uses a Sony image sensor. Aside from that they use a completly different image/video processor (which does the encoding of the RAW sensor data). So I am quite sure your speculations are wrong.

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