Delete a VMFS data store or Unmount and detach

All,

I need your assistance in this matter. I have 55 VMFS 3 datastores which I want to upgrade to VMFS5. I want to take advantage of the 1mb block size so I need to delete the data store then recreate it and format it with the 1mb vmfs5 block size

question:

right click data store, delete, recreate

or

follow instructions on kb 2004605 which states to unmount, then detach.