I've got 32GB micro SD cards in a few of my boxes - neater than a USB stick hanging out of the back of the box and they all record and timeshift without any issue. Setup was easy I think it was - menu, mounts, device manager. You should be able to format it from there and then set it as HDD
Yes, just google partition and formatting tools for mac.
The box just seems to struggle to format larger microsd's for some reason.
I just checked Amazon and it's at least £30 for a 128gb microsd. £8 for a 256gb drive just isn't realistic.
Making progress, but having trouble mounting getting the zgemma to see the sd card. It does see the usb stick! I Formatted sd to ext 4 The sd seems to mount ok but when you go to > Info > Devices it is not detected but the usb is detected as an HDD rather than usb could tis be part of the problem? I have now tried many different formatting tools but to no avail. Any ideas gratefull received ps 64gb scan disc ultra card!