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 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.
An HDD storage medium is actually the worst storage medium across all 2 in 1 laptops that are a similar age to the Pavilion x360.
The best storage medium amongst similar types of laptop is SSD.