The HP 640 MT has an SSD storage media which is faster than most many processor cores desktop computers that are a comparable age to it. Most recently released many processor cores desktop computers have an HDD storage media. 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 desktop computer's storage speed (SSD) is actually the best storage speed across all PCs that have been on the market for the last year.
Across comparable types of desktop computer the worst storage speed is HDD.