The ZBOX-BI320-U-W2 has an SSD storage medium which is faster than the HDD storage medium found on most personal computers of a similar age and type to 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.
This computer's storage speed (SSD) is actually the best storage speed amongst all desktop computers that were released more than two years ago.
An HDD storage medium is the worst storage speed across comparable types of computer.