Emax

Bonjour la liste !
      Did anyone have a chance in using a quantum fireball (FB54S011) 
540 Mb disk with the Emax II ?
      I found two of them in my garage, I could initialize them, but 
since then they don't seem to be recognised by the Emax II.
      When I activate the select drive function, the machine answers 
that it can't find them (something like a "scsi not found message").
      I have successfully connected them to the Mac, so it's a not a 
disk problem.
      Any idea ?
      Thanks in advance.
Gerard.