The EliteBook 755 has a better storage medium than most laptops of this type and age. This notebook PC has an SSD storage medium, whereas most many processor core portable PCs that were released 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 notebook PC's storage medium (SSD) is actually the best storage medium across all laptops of a comparable spec and age to the EliteBook 755.
Across comparable types of notebook PC the worst storage medium is HDD.