how do i add a external harddrive to the vu+ solo

hello all... i am getting somewhere with the box now.. but i have a external toshiba 2.5 hdd... and need it to work on the vu+solo box because i have no space on the box for any images and so on. i have place the hard drive at the back of the box.. it does pick it up.. witch give me the option saing hard drive in the vu setting... i go into the hardrive.. gives me the name of my hard drive witch is cool i belive... then i gives me 3 options 1 harddisk setup 2 initialization 3 filessystem... i go into number 1 it say harddisk standby after... then i go into number 2 saying toshiba 2.5-hdd-external 160.041 gb... i hit ok then it says medoel tosibia usb 2.5-hdd capicity 160.041 gb bus external.. then i hit the red button saying initialize.. then it comes up with this message... unable to initialize harddisk error mount failed.. am i doing something wrong here.. or can i not use this type of hard drive... witch have been format fat32 cheers all lee

blackhole mate.. thanks for your reply... what i am trying todo is use the exetrnal harddrive so my box will take more images so i can really see what i can get cheers lee