The storage speed of this desktop computer is HDD, which is typical of many desktop computers of a comparable age and spec to it. 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.
Alternative HDD personal computers currently available that you might also want to look at include cheaper PCs such as the EliteDesk 800 G1, or the ProDesk 400 SFF both from HP or the DELL OptiPlex 7020.
If the storage speed of this PC is not fast enough for you then you might want to consider the Asus Chromebox (SSD).