Hello there.
I bought Sandisks EXTREME MicroSDXC UHS-I C10 U3 64GB
but it does not even show on the interface.
is there some kind of a "supported SD's" list?

Access your router by Winbox, open System ---> Disk.
Do you see microSD disk there?

that's what i ment by "its not visible in interface"
i can't see any sign of it.

that's what i ment by "its not visible in interface"
i can't see any sign of it.

Seems to be CCR supports only 32 and bellow microsd...I also was not able to use 64gb microsd.

Today I was finally able to see this router with my own eyes ( and hands )
we tried to insert 4GB memory card - no result ...
but wen i inserted 32 GB ... it suddenly apeared, tried to replace it again with 64GB - no result ... back to 32GB - silence... nothing... tried to get 0.5 mm of th card out to see if it connects - nothing...
could it be hardware failure ?
Tonight ill try to reboot the router with SD in it.

After a reboot ... 32GB card is accesable.
tomorrow I will try again with the 64GB

Accessable ... but not usable :/
I can't format it properly ... formating to FAT32 resulted in rubbish in catalogue DISK2 in FILES menu.
after that i tried to format it to ext3 .... aaand the card is gone again. Reboot does not help.

can someone at least show me direction where to look for the cause of such behaviour ?

OK. Case is resolved.
64GB is normally supported, BUT there is no HOTPLUGG feature, so i had to:
insert the card
reboot the router
format the card
reboot the router
and then - the card was fully accesable.

Hello! Please tell which RouterOS version do you use on CCR?
I face the same issue with microSD card 16Gb. When my filesize reaches 390-400Mb, the read/write speed extremely falls down to zero.