The ZBOX PI320 pico has an SSD storage medium which is faster than the HDD storage medium found on most comparable spec computers that have been on the market for around the same time as it. 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 computers of this type and age.
The worst storage speed amongst similar types of computer is HDD.
It may also be worth considering one of the alternative SSD PCs currently available including because of it's better review score, the Zotac ZBOX CA320 nano.
Desktop computers with a faster storage speed that might be worth looking at include the Apple Mac Pro (Flash).