Predictably the no-brand micro SD card (“NCard 3.70 GiB“) that came supplied with the Trim Slice failed completely after a month of light use.
I don’t know whether to blame Trim Slice or the UK resellers, but I expect better for a machine that costs over £250.
Richard WM Jones 
It’s an SD card. What did you expect? If you want reliability, let the OS see the flash directly. Don’t have a “file system” internally, written by the same crack-smoking hobos they drag in off the street to write PC BIOSes.
LOL at “crack-smoking hobos” …