The Latitude E6440 has an SSD storage medium which is better than most similar spec notebook PCs that have been available for around the same time as it. Most medium processor core notebook PCs that have been on the market for around the same time as 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 laptops that came out around the same time as the Latitude E6440.
An HDD storage medium is the worst storage medium amongst comparable types of notebook PC.
It may also be worth also looking at one of the other portable PCs that have an SSD storage media currently available including because of it's better review score, the XPS 13[pl_2556381_price], or the XPS 13[pl_2556381_price] both from DELL.