The MSI GS70 2QE has an SSD storage medium which is better than the HDD storage medium found on most similar spec laptops that came out around the same time as it. In addition, this MSI laptop have an hdd and ssd storage medium. Solid State Drives (SSD) store data in semiconductors on a circuit board rather than using magnetic or optical media. Solid State Drives have no moving parts which makes them very fast and reliable.
An SSD storage medium is in fact the best storage medium across all laptops of this type and age.
The worst storage medium amongst similar types of notebook PC is HDD.