Have a Western Digital 1TB internal 3.5" HDD
Just stopped during use ....
Drive is under warranty so should get it replaced - but they won't
recover the data.
I had a backup .. but a months worth is missing .... (should backup more
than once a month I know)

On windows PC it is no longer seen, a friend connected it to a MAC and
it could be seen & scanned .. but he was unable to recover any files.

Anybody know of anyone that does data recovery as a sideline ?

Professional companies charge hundreds to do this.

In case someone suggests it - I have tried the freezer trick.