The storage speed of this computer is HDD, which is typical of many computers of this age and spec. A Hard Disk Drive (HDD) is the traditional storage method for computers. A HDD stores the information on magnetic disks. HDD drives are cheap, but they are slower than Flash and SSD bases storage systems.
There are a number of alternative HDD personal computers currently available which you might want to consider including the ThinkCentre E73 SFF, or the ThinkCentre E73 both from Lenovo which is cheaper.
Computers with a faster storage speed that might also be worth looking at include the HP EliteDesk 800 G1 Mini (SSD).