The Mac Mini Late 2012 has an SSD storage medium which is faster than most computers of a similar age and spec to it. Most comparable spec PCs 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.
This PC's storage speed (SSD) is actually the best storage speed amongst all desktop computers of this type and age.
Amongst similar types of PC the worst storage speed is HDD.
It may also be worth also looking at one of the alternative SSD computers currently available including because of it's better review score, the Zotac ZBOX CA320 nano.
If the storage speed of this medium processor core computer is not fast enough for you then you might want to look at the Apple Mac Pro (Flash).