The EliteBook Folio 1020 has an SSD storage medium which is better than the HDD storage medium found on most notebook PCs of a similar age and spec to 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.
An SSD storage medium is in fact the best storage medium amongst all medium processor core laptops that have been available for a similar time to the EliteBook Folio 1020.
An HDD storage medium is the worst storage medium across comparable types of portable PC.