I was looking to buy a AXT1800 as it's on sale. I wanted to know, is the 512GB SD Card a hard limit or can you use a 1TB SD in there?
With a SD card, can you setup Samba share to it? I was thinking of using it to share files while on holiday with the family and also somewhere to backup phones at the end of the day.
I think that it's a software limit, more than a hardware limit (there are very few 1 TB cards on the market currently).
For Samba, openWRT installed in the router can have plugins for that, like luci-app-samba4 which has support for external media like microSD. You can download it directly to the router:
I received the AXT1800 and can confirm you can setup the Samba on the SD Card which is great. I was able to stream directly from the share without any lag.