The DELL XPS 13 has a better storage medium than most similar spec laptops that came out more than two years ago. This notebook PC has an SSD storage medium, whereas most notebook PCs of a comparable type and 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 portable PC's storage medium (SSD) is actually the best storage medium amongst all similar spec portable PCs that are a comparable age to the XPS 13.
Amongst comparable types of portable PC the worst storage medium is HDD.
Laptops with a better storage medium that might also be worth looking at include the T420s (£399.00) (SSD), or the S540 (SSD) both from Lenovo.