The HP ZBook 14 has a better storage medium than most comparable spec laptops that have been available for more than a year. This HP notebook PC has an SSD storage medium, whereas most medium processor core laptops that have been on the market 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.
An SSD storage medium is actually the best storage medium across all laptops of this type and age.
The worst storage medium amongst comparable types of portable PC is HDD.
We think you might also be interested in some of the alternative portable PCs that have an SSD storage media currently available including the Z30, or the Z30 both from Toshiba or the DELL Latitude 12 7000 which is cheaper; or the Satellite Z30, or the Satellite Z30 both from Toshiba which has better reviews.