The Samsung ATIV Book 9 has an SSD storage medium which is better than most notebook PCs of a similar age and type to it. Most many processor core portable PCs that were launched 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.
An SSD storage medium is in fact the best storage medium amongst all many processor core portable PCs that came out more than a year ago.
The worst storage medium amongst comparable types of portable PC is HDD.
It may also be worth also looking at one of the other portable PCs that have an SSD storage media currently available including the NP905S3G[pl_1609044_price], or the NP905S3G[pl_1609044_price] both from Samsung which has better reviews.