Migrating additional physical disks to existing virtual machine

I was having difficulty using VMware standalong converter to migrate a physical machine running Ubuntu Linux to an HP DL380 G5 virtual server. The conversion always failed during disk initialization and in the end I concluded that it was because the volumes were large and the log indicated that the initialization and format of the new virtual disks exceeded the 3600 second time limit. I tried editing the disk conversion settings, making the disks 'thin', forcing sector copies etc. and nothing seemed to help. So I decided to try to do the conversion in pieces. I successfully created my virtual machine with the OS and / partition, but now I need to add the other two (large) volumes from the virtual machine. I am using the free Vsphere software... so solutions that include buying a $5000 module from VMware aren't very helpful. Summary - I now have my target VMware virtual machine, what I want to do is migrate two existing physical volumes to my new virtual machine... how do I do that? (the physical volumes are 300gb and 900gb raid 6 arrays)