I think I now have another potential issue that I did not consider.
The converter looks like it should work fine, which is awesome, but I didn't consider the fact that vmware esxi would be installed on the main datastore? Is this true? If that's the case would the only way to be able to recreate that datastore, be by reinstalling esxi?
They have esxi 4.1, would I have to proceed in the following manner to do this correctly assuming the above?
1. Attach another hdd to server
2. Create datastore on new hdd
3. Convert current VMs to new datastore/hdd
4. Unplug new datastore/hdd
5. Reinstall Vmware Esxi (can I go to 5.1 from the original 4.1 instal?)
6. Resetup the datastores the way I want.
7. Re-plug in the new datastore/hdd
8. Convert VMs back to the newly set up datastores.