Windows was unable to save all the data for the file F:\$Mft. The data has been lost. This error may be caused by a failure of your computer hardware or network connection. Please try to save the file elsewhere.
Using Windows for public transport screen systems: "Windows was unable ..."
Oh yes, and of course it is waiting for OK confirmation. Maybe better use a capable operating system...
Seen in U3 subway between Schlump and Sternschanze on Wednesday 2015-08-05 19:35