The Tecra Z40 has an SSD storage medium which is better than most medium processor core laptops that were launched more than a year ago. Most medium processor core laptops that are a similar 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.
An SSD storage medium is in fact the best storage medium across all medium processor core laptops that are a similar age to the Tecra Z40.
Across comparable types of notebook PC the worst storage medium is HDD.
If the storage medium of this portable PC is not good enough for you then you might want to look at the DELL Latitude 12 E7250 (SSD).