The Lenovo Yoga 2 has an HDD storage medium which is better than most comparable spec laptops that have been on the market for more than a year. Most portable PCs that have been on the market 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.
An HDD storage medium is actually the worst storage medium amongst all 2 in 1 laptops that have been available for a similar time to the Yoga 2.
The best storage medium across similar types of laptop is SSD.