The Lenovo Y50 has an SSD storage media which is better than most comparable spec notebook PCs that have been around for around the same time as it. Most comparable spec portable PCs 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.
This portable PC's storage medium (SSD) is in fact the best storage medium amongst all portable PCs of this age and type.
An HDD storage media is the worst storage medium across similar types of portable PC.