Jonathan de Boyne Pollard wrote in a message to Alan Clifford:

AC>
  > Under dos, I use int 21h, function 44h to switch the floppy
  > drive to 'b' to avoid the dos message "insert disk in drive
  > b" which occurs when 'a' and 'b' share the same physical
  > drive.
AC>

JdBP>   Turn off the hard error handler using DosError for the
JdBP> duration of the   open call, or use the
JdBP> OPEN_FLAGS_FAIL_ON_ERROR flag to DosOpen. 

Hello Jonathan,

I see that these are in os2emx.h but, unfortunately, I don't know how to use them :-(

Alan
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