The EliteBook 840 has a better storage medium than most medium processor core laptops that have been around for around the same time as it. This notebook PC has an SSD storage medium, whereas most medium processor core laptops that were released one year ago 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.
This laptop's storage medium (SSD) is actually the best storage medium amongst all similar spec portable PCs that have been on the market for around the same time as the EliteBook 840.
The worst storage medium across similar types of laptop is HDD.
It may also be worth also looking at one of the other laptops that have an SSD storage media currently available including the 13Z940, or the 13Z940 both from LG or the DELL Latitude 12 E7250 which has better reviews.
If the storage medium of this notebook PC is too bad for you then you might want to look at the DELL Latitude 14 E7450 (SSD).