The Yoga 2 11 has an HDD storage medium which is better than the SSD storage medium found on most notebook PCs of a comparable age and type 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.
An HDD storage medium is in fact the worst storage medium amongst all 2 in 1 laptops that were released around the same time as the Yoga 2 11.
The best storage medium across similar types of portable PC is SSD.