Recovery error

I'm getting this error : "The device is not ready" when I mark files I want recovered and try to save them to a directory. I'm saving the files to my main C drive and recovering from an external backup drive. I don't understand why I should be getting this error. What am I doing a wrong? Thanks for any help. I'm new at with Recuva and its probably a simple error.

What kind of drive are you recovering from i.e. SATA, PATA or USB??

Also could you run Recuva with /debug and upload the log file while you're attempting to recover your files.

Richard S.