SD WR slow check app , whats this mean?
- Thread starter cbgeorge
- Start date
well, quite literally it is saying that a WR - write speed - to your SD card is too slow.
what SD card do you use? it should be one that allows 100mbs write speed. if you think card should be fast - format it in the go4 app.
which one exactly?
dunno, some of them are fakes, who knows. try to format card with NTFS on the PC, then put it into the drone and reformat it in there, see if error clears, if not - get a better card.
one i use now is this -
https://www.amazon.com/gp/product/B06XX3X9JD/ref=ppx_yo_dt_b_asin_title_o02__o00_s00?ie=UTF8&psc=1
and this
https://www.amazon.com/gp/product/B072W7Z79R/ref=ppx_yo_dt_b_asin_title_o04__o00_s00?ie=UTF8&psc=1
this one - U3 A2 - is a fake and is not good at all:
https://www.amazon.com/SanDisk-128G...&qid=1549921704&sr=1-3&keywords=Sandisk+128GB
PS. i started reading reviews on my 128gb card and it is also claimed as a fake - i tried it on my PC and it gave me 75mb/sec write speed. not sure good or bad, fake or not - but it works recording 4K30 dlog-m stream ok.
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I guess it is probably impossible to find out if a card is fake or not, this one has the big U with the 3 in it i guess means class 3, suppose to be 100mps write speed
U3 doesn’t mean fast enough.
Best Memory Cards DJI Mavic 2 Pro / Zoom - Alik Griffin
Best Memory Cards DJI Mavic 2 Pro / Zoom - Alik Griffin
That link says it's fast enough, which is true:
"If you’re just shooting video, you will not need the fastest card, only a card fast enough to handle 4k 100mbps, which means almost any U3 card."
On top of that the Mavic 2's mSD slot is quite slow in the grand scheme of things (it's only UHS-I).
Faster cards will help with buffer clearing if you are taking rapid-fire RAW images, but the weak link there is the slow mSD slot in the Mavic 2.
Nobody should be getting a write speed warning with a quality U3 / V30 card shooting video. Could be a defective card or a knockoff or something along those lines. Amazon and eBay have been known to sell knockoff cards, unintentionally.
OP - I suggest trying a different card or two to verify if the problem is with the card or the drone. Stick to name brand cards purchased from a trusted source if you haven't already (SanDisk, Samsung, Lexar, etc.)
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The U3 does not mean 100Mbps write speed, nor does it mean class 3 (there are two different speed classes on a card). It represents the UHS speed class (not to be confused with the UHS bus speed), which indicates a minimum sustained write speed of 30MB/s which is 240Mbps.
The mSD card manufactures do not make it easy, but if you follow the symbols you are good to go - I suspect you just got a bad card if your particular U3 card is giving you slow write speed warnings.
Be weary, there are stacks of counterfeit SD cards, Sandisk especially seem to get hit by these scumbags. You pay the full price for a 100mb capable card and end up with something that struggles with 20.
Mike4884
Well-Known Member
Stay away from ebay, i bought one from a 3rd party vendor last year on Amazon uk that was fake too, choose your vendors wisely
I did some research on fake micro sd cards, lots of them out there, but got mine at walmart and downloaded a pgm to test cards for their actual size and read/write speed, my cards tested out good and above 75 mb/sec speed which should be around 100 but say could be some loss thru a adapter to read them. If any one wants to verify their SD cards, download H2testw pgm at Download H2testw 1.4
Does not matter how you film - you can start camera indoors holding drone in your hand, no props spinning.
there are loads of fakes around, i use samsung, and i have sent them pictures of cards and they come back really quickly to let me know if they are fake. the newer samsung cards can be checked easily by looking at their website. My experience is with ebay and amazon, so far the cards purchased from amazon have been genuine, ebay dont care and dont even respond when i have reported fakes
Sniperfritz
Well-Known Member
benchmark the SD card on your computer to see how fast it really is. I used CrystalDiskMark to test mine before I installed it on my Mavic 2 Zoom.
Just pop it in a card reader and transfer some big files to/from the card - have a look at what the sustained speeds look like and make sure there are no bottlenecks (either the card reader or the USB port). That is a quick & dirty way anyway. You can also run specific software to test them. eBay is notoriously bad for fake cards, I would avoid them entirely though I doubt many people go there for their cards. Amazon is usually pretty good, all of my cards are from Amazon and I've never had any issues. If you're in the USA, I recommend using B&H for these sorts of purchases.
UPDATE.. Flew today and everything worked out good so it was a card issue. had formatted the card in the NTFS ?? format and formatted again in the bird, flew good and recorded with no issue
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