The ATIV Book 9 has an SSD storage media which is better than the HDD storage media found on most many processor cores laptops that are a similar 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 portable PC's storage medium (SSD) is in fact the best storage medium amongst all portable PCs of a similar age and type to the ATIV Book 9.
The worst storage medium across similar types of portable PC is HDD.