The Latitude 14 E7440 has a better storage medium than most notebook PCs of a similar age and spec to it. This notebook PC has an SSD storage medium, whereas most medium processor core laptops 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 in fact the best storage medium amongst all medium processor core laptops that are a similar age to the Latitude 14 E7440.
Amongst similar types of notebook PC the worst storage medium is HDD.
If you are looking for a laptop with a better storage medium then you might also want to consider the DELL XPS 13 (£491.96) (SSD).