The HP EliteBook 850 has a better storage medium than most portable PCs of this age and spec. This portable PC has an SSD storage medium, whereas most notebook PCs of a similar type and age 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 medium processor core laptops that have been available for a comparable time to the EliteBook 850.
An HDD storage medium is the worst storage medium amongst comparable types of portable PC.
Other laptops that have an SSD storage media currently available which you might also want to look at include cheaper portable PCs such as the DELL XPS 13[plb_2417241_price], or the Lenovo X1 Carbon[plb_2907060_price].
If you want a notebook PC with a better storage medium then you might want to consider the Lenovo T420s[plb_48433_price] (SSD), or the HP EliteBook 820[plb_2353434_price] (SSD).