The ZBook 14 has a better storage medium than most laptops of a similar age and spec to it. This HP laptop has an SSD storage medium, whereas most medium processor core notebook PCs that have been around for around the same time as it have an HDD storage medium. Solid State Drives (SSD) store data in semiconductors on a circuit board rather than using magnetic or optical media. Solid State Drives have no moving parts which makes them very fast and reliable.
This portable PC's storage medium (SSD) is actually the best storage medium amongst all portable PCs of this type and age.
The worst storage medium across comparable types of portable PC is HDD.
If you would prefer a laptop with a better storage medium then you might want to consider the Elitebook 820 G2 (£750.00) (SSD), or the EliteBook 820 G2 (£529.99) (SSD) both from HP.