The HP ZBook has a better storage medium than most many processor core portable PCs that were released more than two years ago. This portable PC has an SSD storage medium, whereas most comparable spec laptops that have been around for a similar 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 across all many processor core portable PCs that came out more than two years ago.
An HDD storage medium is the worst storage medium amongst similar types of laptop.
There are a number of alternative laptops that have an SSD storage media currently available which you might also want to look at including the HP EliteBook 745[plb_2446437_price] which is cheaper.
If the storage medium of this portable PC is too bad for you then you might want to look at the ZBook 15[pl_1632630_price] (SSD), the ZBook 17[pl_2036831_price] (SSD), or the ZBook 15[pl_2156059_price] (SSD) all from HP.