The HP Z840 has an HDD storage media which is faster than most PCs of a comparable age and spec to it. Most similar spec PCs that were released more than two years ago have a Flash storage media. 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 media is actually the worst storage speed across all many processor cores desktop computers that are a comparable age to the Z840.
Across similar types of personal computer the best storage speed is SSD.