The ZBOX-OI520-BE has an HDD storage medium which is faster than the Fusion Drive storage medium found on most computers that were released more than two years ago. A Hard Disk Drive (HDD) is the traditional storage method for computers. A HDD stores the information on magnetic disks. HDD drives are cheap, but they are slower than Flash and SSD bases storage systems.
An HDD storage medium is in fact the worst storage speed across all PCs of this age and spec.
Across comparable types of computer the best storage speed is SSD.