Strip it until it looks like a bog standard drive, if it's USB I guess you have an external drive in a branded case, break open the case and remove the drive and any bridge board it may have on it, then simply plug the power and IO leads from the new case to the drive, slot it in and close it up, hth.
========================================================
DOING ANYTHING I HAVE SUGGESTED IS AT YOUR OWN RISK, NEITHER I NOR SEAGATE TAKE ANY RESPONSIBILITY, IT'S YOUR CHOICE TO DO WHAT YOU FEEL IS BEST FOR YOU
