The HP 440 MT has an SSD storage medium which is faster than most PCs that were launched more than a year ago. Most computers that have been available for around the same time as it have an HDD storage medium. 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.
An SSD storage medium is actually the best storage speed across all comparable spec desktop computers that have been available for a similar time to the 440 MT.
The worst storage speed across comparable types of PC is HDD.