The HP ZBook has a better storage medium than most many processor core laptops that have been on the market for more than a year. This notebook PC has an SSD storage medium, whereas most notebook PCs that have been available for a comparable time to 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.
An SSD storage medium is actually the best storage medium amongst all many processor core laptops that have been around for around the same time as the ZBook.
Amongst comparable types of notebook PC the worst storage medium is HDD.
It may also be worth also looking at one of the alternative portable PCs that have an SSD storage media currently available including cheaper notebook PCs such as the Y50 (£1,061.49), or the Y50 (£1,061.49) both from Lenovo.
If you are looking for a portable PC with a better storage medium then you might want to consider the ZBook 17 (SSD), or the ZBook 17 (SSD) both from HP.