This is a question open for all Brax 3 owners.
Which sd cards have you used and confirmed working,
please link to the specific ones you purchased, (as there are lots of fakes out there)
What is the biggest card 256GB and above that anyone has confirmed formatted and working in the phone. anyone managed to get a 512 or 1tb working?
Game On
Still waiting for 256GB SD card from Brax 3. It’s been over a year!
You must not have read the latest news mailshot. They cant do it. So they are giving us a voucher to use on the brax store instead. Still cant believe nobody has tried a card yet
Well I can chime in but I don’t think you will find my answer that helpful 
I can confirm a 64GB SanDisk Extreme from 2019 works in the Brax3
Brilliant Rik, Thanks for your input boss, that’s exactly what his post is for.
256GB is the maximum officially supported accordjng to the documentation IIRC.
Thanks Chief,
Yes we know that’s the official line. I can confirm that an ‘Integral’ brand bottom end 256gb micro sd works a treat in the Brax, just a bit slow on transfer obviously.
I know android phones that can take 1TB micro sd cards no bother.
Wondering if any legends out there that have a 512gb or 1TB micro sd the are wiling to format/try?
I’ve used this in two Brax3 with no issues.
Where you may run into issues with a card larger than 256GB is if you format the card as part of the onboard filesystem, instead of a separate filesystem. That is where I could see issues come into play.
That is questionable…. Ever since the Brax3 was on Induegogo it has a listing that some, including myself, questioned. I posted the page here… but somewhere I found maybe the chip manaufacture site, that the chipset supoprted 512 for the SD Card itself.
OK, so I think it was that the 6300 supports UFS 2.2, which in turn supports up to 512GB… that may be why I tried it.
And Lexar lists this
Anyway, it works with both exFAT and EXT3/4 formatted on a linux box. And i swap it between two Brax 3 and a Fairphone 4 with e/os A14. Never have issues.
One more link… sorry fo rthe editmania
Yes Papercut,
Now that’s goods I’m talking about, thankyou brother.
I’ve just ordered a Lexar Silver 512gb to try that one out.
So you recommend formatting the card as and external card, and not part of the Brax phone file system?
My issue is that I wanted to use the card to expand my phones ability to download music from the Spotify app for offline listening.
I can now confirm that the Lexar Silver Plus Micro SD Card 512 GB, formats and works flawlessly up to 205 MB/s Read Speed, 150mb read speed, in the BRAX
thanks again everyone for your input
flawlessly up to 205 MB/s Read Speed, 150mb read speed, in the BRAX
Thats a good rate. Better than my card on the write side for sure.
So I read an interesting post a while back where someone “extended the interal file system” with their SDCard. Then a short while later the card failed (maybe becasue they exceeded the UFS 2.2 spec with too large a card) and their device was corrupt. The interesting part of the post was that they could read data on anything under the 256GB limit on that external card. But everything outisde of that was bad. So in essence it corrupted heir file system. (that was the theory anyway)
And that is why I referred to the UFS 2 spec, and the confusion around what size card is safe.
If you wish to “extend” the system, then a 256G card would be the max safe size. If you just using as secondary storage, like exFat or something, then you could possibly go even higher than even 512G.
