The Lenovo Yoga 2 has an HDD storage medium which is better than the SSD storage medium found on most 2 in 1 laptops that are a comparable age to it. 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 amongst all portable PCs of this age and spec.
The best storage medium amongst comparable types of portable PC is SSD.