Problem with 4k videos

[Michael Papadopoulos]

The slot on the 950 is for UHS-I cards. (The device supports SDXC 3.01 standard compliant cards. )
You need UHS-3 to write at 4k speeds.
From the wikipedia page
[table="width: 500, class: grid"]
[tr]
[td]Class[/td]
[td]Minimum Serial Data Writing Speed[/td]
[td]Application[/td]
[/tr]
[tr]
[td]UHS Speed Class 1 (U1)[/td]
[td]10 MB/s[/td]
[td]Real-time broadcasts and large HD video files (UHS bus)[/td]
[/tr]
[tr]
[td]UHS Speed Class 3 (U3)[/td]
[td]30 MB/s[/td]
[td]4K video files (UHS bus)[/td]
[/tr]
[/table]
So set it to write at the phone and then later move the video to sd card.

 

[anthonyng]

dunno I recorded a 49sec 4K video on my sandisk extreme pro card and it looks fine.

 

[anthonyng]

So far I tested 15.63 MB/s

5 months later, tested my 64gb sandisk extreme pro micro sdxc (95mb/s read/write).... now is showing 38mb/s! Improved! this is on 10586.318.

I see in the other posted speeds, some are hitting 65mb/s! Maybe that's redstone!

 

[TrueMetalGeek]

What app are you guys using for SD CARD speed tests?
I only saw one app but it seemed to be made a few years ago.
The write speed tested to 20MBps so I hope that is accurate.

I don't record in 4k video that often but when I did record in 4k it seemed to be ok.

 

[anthonyng]

What app are you guys using for SD CARD speed tests?

Yea only one that I know of.

SD Card Speed