The Latitude E6540 has a better storage medium than most comparable spec portable PCs that have been around for around the same time as it. This portable PC has an SSD storage medium, whereas most comparable spec laptops that were released more than two years ago 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 portable PC's storage medium (SSD) is in fact the best storage medium amongst all portable PCs of this type and age.
An HDD storage medium is the worst storage medium amongst comparable types of portable PC.
If you would prefer a portable PC with a better storage medium then you might also want to look at the T420s (£1,388.87) (SSD), or the S540 (SSD) both from Lenovo.