The HP EliteBook 840 has a better storage medium than most medium processor core laptops that were released more than a year ago. This HP notebook PC has an SSD storage medium, whereas most medium processor core laptops that came out 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.
This laptop's storage medium (SSD) is actually the best storage medium across all laptops of a similar spec and age to the EliteBook 840.
An HDD storage medium is the worst storage medium across similar types of laptop.
We think you might also be interested in some of the other portable PCs that have an SSD storage media currently available including the 13Z940 ($743.96), or the 13Z940 ($743.96) both from LG which is cheaper; or the UX303LA, or the UX303LA both from Asus or the DELL Latitude 12 7000 which has better reviews.