The EliteBook 725 has a better storage medium than most portable PCs that have been around for a comparable time to it. This portable PC has an SSD storage media, whereas most similar spec portable PCs that have been around for a comparable time to it have an HDD storage media. 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 media is in fact the best storage medium across all portable PCs of a similar age and type to the EliteBook 725.
Across comparable types of portable PC the worst storage medium is HDD.