The storage speed of this computer is HDD, which is the most commonly found storage medium on medium processor core computers that are a similar age 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.
If the storage speed of this desktop computer is too slow for you then you might also want to consider the 800 G2 SFF (SSD), or the 600 G2 Mini (£1,282.66) (SSD) both from HP.