The Shuttle D 5700XA has an SSD storage medium which is faster than the HDD storage medium found on most comparable spec desktop computers that have been on the market for a similar time to it. 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 computer's storage speed (SSD) is in fact the best storage speed amongst all few processor core computers that have been around for around the same time as the D 5700XA.
Amongst comparable types of computer the worst storage speed is HDD.