I have been using HDTach for many years now and always find it is an invaluable benchmark to ascertain potential levels of performance. HD Tach is a low level hardware benchmark for random access read/write storage devices such as hard drives, removable drives (ZIP/JAZZ), flash devices, and RAID arrays. HD Tach uses custom device drivers and other low level Windows interfaces to bypass as many layers of software as possible and get close to the physical performance of the device.
HD Tach 18.104.22.168. tends to underscore drives, and we can see the average transfer rate is around 82.1 MB/s with burst speeds up to 236.2 MB/s. Fairly healthy results for a mechanical drive.