Using WD on XBOX360

My Xbox recongizes my hard drive but it cant seem to recongize my hard drive when i try to download demos onto it. I don’t know what to do with the settings because theres hardly any.

What model drive and how is it formatted now? It needs to be formatted FAT32 LOGICAL http://community.wdc.com/t5/My-Book-for-PC/PS3-Get-External-Drive-to-work/m-p/85713/highlight/false#M3356

Joe