The HP EliteDesk 705 G1 has an SSD storage media which is faster than the HDD storage media found on most desktop computers that were released around the same time as 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.
An SSD storage media is in fact the best storage speed across all PCs of a comparable age and spec to the EliteDesk 705 G1.
The worst storage speed amongst similar types of desktop computer is HDD.