I used to use a script , but I've also had a lot of sucess with using Wastefinder , which is part of the Vkernel Capacity Management suite.
Thanks for the prompt response, However im not sure we are licenced for this product.
Try the powershell alternative...
if that script is lookinf for .VMDK files that are not referenced in a VMX file then its bound to pick out your console VMDK.
my advice....update to ESXi while you can