The EliteBook 745 has an SSD storage medium which is better than most similar spec laptops that are a comparable age to it. Most many processor core portable PCs that have been on the market for a comparable time 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.
An SSD storage medium is actually the best storage medium amongst all comparable spec laptops that have been available for more than two years.
An HDD storage medium is the worst storage medium amongst similar types of laptop.
Notebook PCs with a better storage medium that might be worth considering include the ZBook 15 (SSD), the ZBook 17 (SSD), or the ZBook 15 (SSD) all from HP.