High speed, data consistency, and valuable functions.1.  HDD duplicators support all brands of HDDs. These duplicators copy bit-by-bit at high speeds, which takes around 1~3 hour to finish a 1TB HDD. (Actual speeds vary based on HDD and duplicator models).2.  HDD duplicators support "data-only quick copy." Allowing users to save time by skipping empty HDD sectors. 3. Aside from using the copy function, additional features and functions are added; such as the erase function and DOD erase.