The Zotac ZBOX CA320 nano has an SSD storage medium which is faster than most medium processor core computers that are a similar age to it. Most medium processor core computers that were released more than two years ago 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.
An SSD storage medium is in fact the best storage speed across all medium processor core computers that have been around for a comparable time to the ZBOX CA320 nano.
Across similar types of computer the worst storage speed is HDD.