Further I have yet to be able to add any of these to my esx servers. While the ESX server finds the target when it attempts to fdisk and format it appears to fail with

Error during the configuration of the host: cannot open volume .vmfs/volumes/4cblablabla...

I have made the File IO change (from block IO) that was mentioned in another thread and this at least allowed me to get through the adding a storage device wizard, but it still failed in the end...