The Portégé Z30-A has an SSD storage medium which is better than the HDD storage medium found on most portable PCs of this age and type. 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 similar spec portable PCs that have been on the market for a comparable time to the Portégé Z30-A.
An HDD storage medium is the worst storage medium across comparable types of laptop.
If you are looking for a notebook PC with a better storage medium then you might want to look at the DELL Latitude 12 E7250 (SSD).