HD problem

My HD stop working

I have two usb HD, Lacie 250 GB and Seagate 120 GB, connected to my Toshiba Tecra A4 Laptop.

The Lacie HD was rendering a video file and when I turn off the Seagate HD Lacie stop working showing the message “Cant have acces to K:(Lacie)”, “The file or directory is damaged or non readable”(I translated it to english because it was in spanish). Lacie appear on MY PC as a HD…

I don´t know if can Format it to keep using it. I didn´t tried because I want to recover the files it “has”. I know there´s some programs to recover files from damage HD…

Could someone tell me wich programs?

Is there any posibility that I can recover my files?

Thank you