The HP EliteBook 725 has a better storage medium than most similar spec notebook PCs that have been available for around the same time as it. This portable PC has an SSD storage medium, whereas most many processor core laptops that are a similar 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.
This notebook PC's storage medium (SSD) is in fact the best storage medium across all many processor core laptops that were released around the same time as the EliteBook 725.
An HDD storage medium is the worst storage medium amongst comparable types of notebook PC.