The Asus Chromebox M077U has an SSD storage medium which is faster than the HDD storage medium found on most desktop computers of this age and spec. 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 personal computer's storage speed (SSD) is in fact the best storage speed across all few processor core computers that have been on the market for around the same time as the Chromebox M077U.
Across similar types of personal computer the worst storage speed is HDD.