is there any way to recover my old files

[wpiacenti]

i had some files on my hard drive, but when i plugged it in and used super-duper to make a full backup of my computer (which didn't have those files) I clicked on the erase and backup by mistake.

I am assuming that it wrote over everything i had on the drive previously.

does anyone know of a way to recover those old files? Is it still possible?

Thanks