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MicroSD for 4K videos on P3P?

Discussion in 'Pro/Adv Discussion' started by 1vision, Jul 18, 2015.

  1. 1vision

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    My P3P came with Lexar 16GB - but... It's a U1 card, at the same time it's marked 633x.. This is U3 speed...

    I'm looking for a reliable and not too expensive 64 GB that will record 4K without skips etc. UHS1 or UHS3?

    what you use?
     
  2. msinger

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    #2 msinger, Jul 18, 2015
    Last edited: Oct 27, 2015
    S5S5G6 and wotblake like this.
  3. wotblake

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  4. Meta4

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    There's no point paying big $$ to get the "best" card because the Phantom is what determines the speed of writing - not the card.
    Just get any U1/Class 10 card or better and it will be fine.
     
  5. msinger

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    At what speed does the Phantom write RAW files?
     
  6. 1vision

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    RAW photos aren't a problem.
     
  7. 1vision

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    DJI lists 60 mbps for 4k... I can't find actual bitate.
     
  8. msinger

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    4k only writes at 7.5MB/s. Why aren't RAW photos a problem?
     
  9. ctp

    ctp

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    The P3 camera is locked at the slowest SD bus speed, "Normal_Speed", which is 12.5MB/s. Any class 10 card works fine. This is a huge PITA when shooting AEB or rapid photos in RAW where it takes up to 30 seconds just to write the picture data to the card.
     
  10. ctp

    ctp

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    You have that backwards, 4k/UHD video records at 60mbps (7.5MB/s), which any class 10 card can handle.

    RAW photos on the other hand (5AEB or 7 rapid fire) generates 200-300MB of data in less than a second, which is why the camera locks up for 20-30 seconds.

    Doesn't matter how fast the card is, the P3 camera is locked at SD bus "Normal_Speed" of 12.5MB/s.
     
  11. msinger

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    Interesting. Many people have been claiming their photos save faster when using faster memory cards. Also, it's odd that DJI ships a memory card that writes at 40MB/s if that's way overkill. Think of the money they could have saved by shipping the Phantom with a slower memory card.

    If your math is correct, doesn't that mean the camera should lock up for 2-3 seconds when taking one RAW photo? Mine does not lock up.
     
  12. S5S5G6

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    The Sandisk extreme pro deal above is cheaper than most MicroSD's at this tier of performance.

    So in this case the "best" is actually not the most expensive. Enjoy it while it lasts.
     
  13. ctp

    ctp

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    Set your camera for 5-AEB or 5 rapid shot and time how long you get the spinning blue circle around the shutter button. Even when I take a single J+R my camera locks up for a few seconds with the blue circle.

    I'll go back and test again, my extensive testing of various memory cards was done with 1.19. I did some informal testing with 1.26 an my fastest card (Sandisk Extreme Ultra 80MB/s that benchmarks at 64MB/s write) and saw similar performance. Given that there will probably be a firmware update any day now, I'll test again after that.