Mongodb installation failure to run mongod

I have downloaded the newest version of mongodb and have moved and renamed the file to mongodb to the directory `usr/local/mongodb`. When I try to run mongod i get the following error ``` `./bin/mongod --help` for help and startup options Sun Apr 15 18:08:25 [initandlisten] MongoDB starting : pid=8801 port=27017 dbpath=/data/db/ 64-bit host=Hanss-MacBook-Air.local Sun Apr 15 18:08:25 [initandlisten] db version v2.0.4, pdfile version 4.5 Sun Apr 15 18:08:25 [initandlisten] git version: 329f3c47fe8136c03392c8f0e548506cb21f8ebf Sun Apr 15 18:08:25 [initandlisten] build info: Darwin erh2.10gen.cc 9.8.0 Darwin Kernel Version 9.8.0: Wed Jul 15 16:55:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_I386 i386 BOOST_LIB_VERSION=1_40 Sun Apr 15 18:08:25 [initandlisten] options: {} Sun Apr 15 18:08:25 [initandlisten] exception in initAndListen: 10309 Unable to create/open lock file: /data/db/mongod.lock errno:13 Permission denied Is a mongod instance already running?, terminating Sun Apr 15 18:08:25 dbexit: Sun Apr 15 18:08:25 [initandlisten] shutdown: going to close listening sockets... Sun Apr 15 18:08:25 [initandlisten] shutdown: going to flush diaglog... Sun Apr 15 18:08:25 [initandlisten] shutdown: going to close sockets... Sun Apr 15 18:08:25 [initandlisten] shutdown: waiting for fs preallocator... Sun Apr 15 18:08:25 [initandlisten] shutdown: lock for final commit... Sun Apr 15 18:08:25 [initandlisten] shutdown: final commit... Sun Apr 15 18:08:25 [initandlisten] shutdown: closing all files... Sun Apr 15 18:08:25 [initandlisten] closeAllFiles() finished Sun Apr 15 18:08:25 [initandlisten] shutdown: removing fs lock... Sun Apr 15 18:08:25 [initandlisten] couldn't remove fs lock errno:9 Bad file descriptor Sun Apr 15 18:08:25 dbexit: really exiting now ```