The EliteBook 725 has an SSD storage medium which is better than the HDD storage medium found on most notebook PCs that came out around the same time as it. 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 portable PC's storage medium (SSD) is actually the best storage medium across all many processor core portable PCs that came out more than two years ago.
Across similar types of portable PC the worst storage medium is HDD.