Trying to partition Ipod. Error -5344

Im trying to partition my ipod to use as a start up disk using DiskUtility. But when I try to partition my ipod I set the option to GUID and then click partition and I get "Unknown error -5344", or I get an error saying "Invalid Argument"? Then i have to restore my ipod on iTunes.Tried about 10 times and can't figure it out Any suggestions on how to fix this would be appreiciated?


Im using an Imac with OS X 10.4

 

Its a 5th Gen 30g Ipod.