Here's my story - I hope some of you find this interesting and is applicable to some of the comments in here...
I recently received an Eachine E520S from Banggood. At the risk of being kicked out of here -
here's the blog entry which is ongoing... it's not an ad, I do this for fun.
Ok, so as a complete drone novice, I picked up this Eachine device and tried it across the road from my house in (very) rural UK, just a few feet from the ground and it was after that that someone in Canada asked me if I had a license! Turns out I may be ok back in rural UK if I'm sensible -something to note for the future.
Anyway, the first thing I noticed after recovering from the excitement of the drone actually working, was the usable but not-exciting quality of the video sent to my Pocophone mobile phone. It was at that point that I first fitted an SD to the drone (read the instructions - always a good idea) - it turns out that this quality gripe is common to many drones - limited bandwidth due to the WiFi connection back to your mobile phone.
Now I had my SD in place - worries over. Except they were not as I could not get anything out of the SD - my own fault for not formatting the SD and giving it basic directories.
The definite fix is referred to in the above-linked blog, but in case that link gets killed (I'm new in here) - format the SD as normal (FAT32) on a PC. I also used a good (but inexpensive from Amazon) SD - a 16GB Sandisk Ultra - class 10 - the same type I regularly use with Raspberry Pi (also covered in the blog). I created folders
video,
tmp and
photo. That may or may not be essential but trust me it works. By the time I finished messing with the SD, I'd missed the best opportunity to capture my pal's hall in Northumberland which was to have been an idylic British location to demo a drone - typical British weather, just as it looks like summer is here, winter returns. In the blog are embedded short video segments of my attempts, for better or worse.
In my early dealings with the drone, I bashed it off my roof a couple of times but it SEEMED to be ok, the only issue being that it would OCCASIONALLY drop for no good reason (not battery, not range, no obvious visible damage other than a tiny blade dent). I took care of the drone as best as a beginner could - as I wanted to save it for my trip to sunny southern Spain where I am now.
A couple of days ago I took it out for a spin near our rural home here in Spain - no problem - again without any SD - I'm in the process of updating the blog right now. This morning I put in a cleanly formatted SD and did a short test - excellent quality video - rubbish content - the next logical step was to take it into the brush area (no-one is out and about up here - I checked) in the middle of our area up in the hills. I sent the E520S (which auto-returns when out of range or when the battery is getting low) over into the overgrown brush valley area, with enough height to ensure there would be no mishaps - and started the local video recording. After an apparently excellent 10 minute performance, I was just starting to have the drone auto-return to me, when, out of no-where, the "dropping" issue returned and it simply fell out of the (completely calm) sky.
Ok, my rubbish logic here - I sent it over the area as it was so inhospitable, there was no chance of anyone being down there.. the fact that this meant there was also no way of spotting and retrieving the drone in the event of a mishap, somehow escaped me at the time - and now, it's too late. Two helpful (and fitter than I) neighbours later, we simply could not find the drone - and to be awkward, it would not even attempt (as it has done successfully in the past) to get back up in the air.
My NEXT drone is getting an alarm bell fitted. Of course as the Eachine comes with spare blades I COULD have fitted them but as a beginner, the very SLIGHT dent I'd put in one of the blades did not seem an issue, in future I'll not be taking chances - but of course, the yearning to send the drone somehere inhospitable was just too much for me to bear. I usually learn the hard way.
This got a bit long - I hope it answers any SD-related questions. With photos, videos, Raspberry Pis and now my sorely missed drone, I've yet to go wrong with genuine class 10 or better Samsung or Sandisk SDs.