The HP Z440 has an HDD storage medium which is faster than most personal computers of a comparable spec and age to it. Most many processor core personal computers that are a comparable age to it have a Flash storage medium. 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 other HDD computers currently available that you might also want to consider including the Z420[pl_2498184_price], or the Z640[pl_2520401_price] both from HP which is cheaper.
Personal computers with a faster storage speed that might also be worth considering include the HP Z440[plb_2466558_price] (SSD), or the Lenovo Thinkstation P500[plb_2535509_price] (SSD) which is also cheaper.