The HP ProBook 655 G1 has a better storage medium than most notebook PCs of this spec and age. This HP notebook PC has an SSD storage medium, whereas most many processor core laptops that are a similar age 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.
This portable PC's storage medium (SSD) is in fact the best storage medium amongst all notebook PCs of this age and type.
The worst storage medium across similar types of portable PC is HDD.