The ZBOX PI320 has an SSD storage medium which is faster than the HDD storage medium found on most PCs of this spec and age. Solid State Drives (SSD) store information in transistors on a circuit board rather than on optical or magnetic media. This has the advantage of being much faster than a traditional HDD drive.
An SSD storage medium is actually the best storage speed across all medium processor core PCs that were released more than two years ago.
The worst storage speed amongst similar types of desktop computer is HDD.