The HP Z840 has an HDD storage medium which is faster than most many processor core personal computers that were launched more than a year ago. Most personal computers that have been available for around the same time as it have a Flash storage medium. 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.
This personal computer's storage speed (HDD) is actually the worst storage speed amongst all many processor core personal computers that were released around the same time as the Z840.
The best storage speed amongst comparable types of personal computer is SSD.