The Samsung ATIV Book 9 has an SSD storage medium which is better than most portable PCs of a comparable age and spec to it. Most medium processor core notebook PCs that were released more than two years ago 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.
This portable PC's storage medium (SSD) is actually the best storage medium amongst all laptops that have been around for a comparable time to the ATIV Book 9.
Amongst similar types of portable PC the worst storage medium is HDD.
Laptops with a better storage medium that might be worth looking at include the T420s (£1,388.87) (SSD), or the X1 Carbon (SSD) both from Lenovo.