The HP Pavilion x360 has an HDD storage media which is better than most 2 in 1 laptops that have been around for a comparable time to it. Most 2 in 1 laptops that have been on the market for around the same time as it have an SSD storage media. 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 media is in fact the worst storage medium amongst all portable PCs of this spec and age.
The best storage medium amongst similar types of notebook PC is SSD.
If the storage medium of this notebook PC is not good enough for you then you might also want to consider the Toshiba U920t (SSD) which also has a higher rating.