The Toshiba S50-B has an SSD storage medium which is better than most laptops of a similar spec and age to it. Most similar spec portable PCs that are a comparable age to it have an HDD 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.
This notebook PC's storage medium (SSD) is actually the best storage medium across all similar spec portable PCs that have been on the market for a comparable time to the S50-B.
Across similar types of notebook PC the worst storage medium is HDD.
Laptops with a better storage medium that might be worth looking at include the DELL XPS 13 (£494.59) (SSD).