1) FOR NEW INSTALLATION: format the drive with the Media Center by goto SETUP -> SYSTEM -> FORMAT follow the instruction and complete the format process.
NOTE: Make sure ALL USB DEVICES ARE REMOVED from the AIOS when you format the drive.
2) After format, go to SETUP -> NETWORK -> FTP SERVER set to ON
3) Go to SETUP -> NETWORK -> SAMBA PROCESS set to ON
Please visit our forums for more detail: http://pivosforums.com/viewtopic.php?f=10&t=37