thanks, I installed the Intel storage drivers
as suggested and restarted Windows 7. I opened the Intel Rapid Storage management utility and clicked 'System Report'. There followed 3 BSOD screens. One suggested disable caching and shadowing- can you comment on that please?
I had to use Startup repair to return to Windows at which point Windows reported "OCZ driver
What would suggest to you that their might be a fault with the SSD itself after all these tests and updates?
thanks for your patience, joe