I have a new HDD arriving Monday under warranty and must give the old
corrupt drive to the courier in exchange.

The old drive does fire up into windows after about 6 hours and it is
possible to access some of my business data, letters, invoices, banking etc.

What do they do with these drives and can I assume the data to be safe in
their hands.

At times, when trying to access files, it tells me the C drive is not
formatted and would I like to format it. Though I have refrained from doing
anything to date I just might give it a try as Monday gets closer. Or will
it just not do it.

dj