To start my mongod with the command as :
C:\mongodb\bin>mongod --config c:\mongodb\etc\mongodb.conf
[mongodb.conf]：
-------------------------------------------------------------
fork = true
bind_ip = 127.0.0.1
port = 27017
quiet = true
dbpath = c:\mongodb\data
logpath = C:\mongodb\log\mongod.log
logappend = true
journal = true
-------------------------------------------------------------
Error：
Error parsing INI config file: unknown opt
try 'mongod --help' for more information

If I delete [fork = true] and command can be run correctly.

I have read the document from here and I want to ask that if [fork] is not being used in the Mongod ?

http://docs.mongodb.org/manual/administration/configuration/