The Mac Mini Late 2014 has a faster storage speed than most few processor core personal computers that have been available for around the same time as it. This computer has a Flash storage medium, whereas most computers of this age and type have an HDD storage medium. Flash Drives 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. Across all few processor core personal computers that have been around for a comparable time to the Mac Mini Late 2014 the storage speed ranges from HDD (worst) to SSD (best).
PCs with a faster storage speed that might also be worth looking at include the Asus Vivo Mini UN62[plb_2865311_price] (SSD) which is also higher rated.