The Lenovo Yoga 2 has an HDD storage medium which is better than most portable PCs of a comparable type and age to it. Most similar spec portable PCs that have been around for around the same time as it have an SSD storage medium. HDD is a traditional storage drive which stores the information on magnetic disks. HDD drives are slower than other forms of storage such as solid state drives (SSD) and flash drives.
This portable PC's storage medium (HDD) is in fact the worst storage medium across all portable PCs of this age and spec.
Across similar types of portable PC the best storage medium is SSD.