The Lenovo X240 has a better storage medium than most portable PCs of this type and age. This notebook PC has an SSD storage medium, whereas most portable PCs 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.
An SSD storage medium is actually the best storage medium amongst all portable PCs of this age and spec.
Amongst comparable types of notebook PC the worst storage medium is HDD.