The ATIV Book 9 has an SSD storage media which is better than most portable PCs that have been around for around the same time as it. Most notebook PCs that were released around the same time as it have an HDD storage media. 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 media is actually the best storage medium amongst all notebook PCs of this age and spec.
An HDD storage media is the worst storage medium amongst similar types of portable PC.
It may also be worth considering one of the alternative portable PCs that have an SSD storage media currently available including because of it's better review score, the NP905S3G[pl_1609044_price], or the NP905S3G[pl_1609044_price] both from Samsung.