The EliteBook 840 has an SSD storage medium which is better than the HDD storage medium found on most medium processor core notebook PCs that have been around for a comparable time to it. 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 across all portable PCs of this age and spec.
Across comparable types of portable PC the worst storage medium is HDD.
There are a number of alternative portable PCs that have an SSD storage media currently available which you might also want to look at including the 13Z940[pl_2362386_price], or the 13Z940[pl_2362386_price] both from LG or the DELL Latitude 14 E7450[plb_2882103_price] which is cheaper.
Laptops with a better storage medium that might also be worth considering include the DELL Latitude 12 E7250[plb_2885455_price] (SSD), or the Asus UX301LA[plb_3012166_price] (SSD).