Data recovery from an unformatted hard drive full of data

[nukecad]

Is this the deleted data that you want, or is it the undeleted data on a drive that has lost it’s formatting and is now “RAW”?

If it’s the undeleted data that you are after then see:

Recover non-deleted files from Crashed/Reformatted drive

The Free version of Recuva should be all you need, it does the same as the Pro version but without paying for Technical Support. https://www.ccleaner.com/recuva (Other recovery apps are avaiable). Note that you should change your computers Power & sleep settings to 'Never' before starting any recovery attempt. A recovery scan can take hours and if the computer sleeps/hibernates before it has finished then you will probably have to start all over again. Don't try to save anything …