Error Codes

FSDs should use existing error codes when possible. New error codes must 
be in the range reserved for FSDs. The FS_FSCTL interface must support 
returning information about new error codes. 

The set of error codes for errors general to all FSDs is 0xEE00 - 0xEEFF. 
The following errors have been defined: 

oERROR_VOLUME_NOT_MOUNTED = 0xEE00 - the FSD did not recognize the volume 
. 
  

The set of error codes which are defined by each FSD is 0xEF00 - 0xFEFF.