StarTech.com duplicators were not designed to recover failing or damaged drives. If the duplicator encounters a corrupt or unreadable sector, the duplication halts and fails.
SATDOCK4U3RE, SATDUP13 ,and UNIDUPDOCK all include a function that allows the duplicators to skip over corrupt or unreadable sectors. However, if the duplicators encounter too many errors, they still halt and fail. If this happens, you will need third-party recovery software or custom-built recovery hardware to copy from a failing or damaged drive.