From: ohland@charter.net   
      
   Creating new image files   
      
   Empty image files can be created using operating system tools:   
      
        Windows: fsutil file createnew HD1.img 1073741824 (1 GB)   
        Linux: truncate -s 1G HD1.img   
        Mac OS X: mkfile -n 1g HD1.img   
      
   If you need to use image files larger than 4GB, you must use an   
   exFAT-formatted SD card, as the FAT32 filesystem does not support files   
   larger than 4,294,967,295 bytes (4GB-1 byte).   
      
   ZuluSCSI firmware can also create image files itself. To do this, create   
   a text file with filename such as Create 1024M HD40.txt. The special   
   filename must start with "Create" and be followed by file size and the   
   name of resulting image file. The file will be created next time the SD   
   card is inserted. The status LED will flash rapidly while image file   
   generation is in progress.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)