Messing with it may break it, esp if used with a 32bit OS.
It uses some partitioning under the covers to get it to work already.
If you still want to; I believe Diskwizard is what you need to do the job.
http://www.seagate.com/support/internal-hard-drives/enterprise-hard-drives/savvio-15k/discwizard-master-dl/