The ZBOX CI321 nano Plus has an SSD storage medium which is faster than most few processor core computers that have been available for around the same time as it. Most PCs that have been on the market for a comparable time to it have an HDD storage medium. 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.
This computer's storage speed (SSD) is actually the best storage speed amongst all comparable spec computers that have been on the market for around the same time as the ZBOX CI321 nano Plus.
The worst storage speed across similar types of computer is HDD.