The DELL Latitude E6440 has a better storage medium than most medium processor cores portable PCs that have been on the market for more than two years. This DELL portable PC has an SSD storage media, whereas most comparable spec laptops that have been around for around the same time as it have an HDD storage media. 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 media is in fact the best storage medium amongst all laptops that are a similar age to the Latitude E6440.
An HDD storage media is the worst storage medium across similar types of portable PC.