The EliteBook 745 has an SSD storage medium which is better than most laptops that were released more than two years ago. Most laptops 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 portable PC's storage medium (SSD) is actually the best storage medium across all comparable spec notebook PCs that have been available for around the same time as the EliteBook 745.
Across comparable types of portable PC the worst storage medium is HDD.