The EliteBook 840 G1 has a better storage medium than most laptops of this age and spec. This HP notebook PC has an SSD storage medium, whereas most notebook PCs of a comparable age and spec 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 in fact the best storage medium amongst all laptops that were released more than two years ago.
An HDD storage medium is the worst storage medium across comparable types of portable PC.
If the storage medium of this notebook PC is too bad for you then you might want to consider the DELL XPS 13 (£491.96) (SSD).