The NP905S3G has an SSD storage medium which is better than the HDD storage medium found on most notebook PCs of a comparable spec and age 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.
This notebook PC's storage medium (SSD) is actually the best storage medium amongst all many processor core laptops that have been around for more than two years.
An HDD storage medium is the worst storage medium amongst comparable types of notebook PC.