Sorry for the delay in responding but I have been to the Seagate web site
and downloaded and tried both SeaTools for Windows and Seagate DiskWizard.
Seagate DiskWizard told me, despite the fact that I have three working
Seagate ST3500630AS hard drives, that it could not proceed because "To use
the product, at least one Seagate or Maxtor device should be installed on
your system". I have tried the Seagate FAQ's but no joy so I have left a
message with Technical Support.
SeaTools for Windows generated a "Unhandled exception - parameter is not
valid" error message. I have reported this too.
Despite not solving my problem, neverthless, I am grateful for your help.