The Samsung ATIV Book 9 has a better storage medium than most portable PCs of this age and spec. This Samsung laptop has an SSD storage medium, whereas most portable PCs that were released 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 actually the best storage medium across all similar spec portable PCs that were released around the same time as the ATIV Book 9.
The worst storage medium amongst similar types of laptop is HDD.
Other portable PCs that have an SSD storage media currently available that you might also want to consider include because of it's better review score, the Chromebook 11 2955u, or the Chromebook 11 2955u both from DELL.