The EliteDesk 705 G1 SFF has an SSD storage media which is faster than most few processor cores computers that have been available for around the same time as it. Most desktop computers of this age and type 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.
An SSD storage media is in fact the best storage speed amongst all personal computers of this spec and age.
The worst storage speed amongst comparable types of computer is HDD.