The Lenovo 11e has an SSD storage medium which is better than most portable PCs of a comparable type and age to it. Most similar spec notebook 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.
This notebook PC's storage medium (SSD) is in fact the best storage medium amongst all portable PCs of a similar spec and age to the 11e.
The worst storage medium across similar types of notebook PC is HDD.