The HP Z440 has a faster storage speed than most comparable spec computers that have been available for more than a year. This computer has an SSD storage medium, whereas most medium processor core PCs that were released one year ago have an HDD storage medium. Solid State Drives (SSD) 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.
An SSD storage medium is actually the best storage speed amongst all PCs of a comparable age and spec to the Z440.
An HDD storage medium is the worst storage speed amongst comparable types of computer.
It may also be worth considering one of the alternative SSD personal computers currently available including cheaper desktop computers such as the HP ProDesk 600 SFF[plb_2363340_price], or the Lenovo Thinkstation P500[plb_2765683_price].