The HP Pavilion x360 has an HDD storage medium which is better than the SSD storage medium found on most 2 in 1 laptops that are a similar 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 notebook PC's storage medium (HDD) is actually the worst storage medium amongst all laptops that were launched more than two years ago.
Amongst similar types of notebook PC the best storage medium is SSD.