The Asus UX301LA has an SSD storage medium which is better than most notebook PCs of this spec and age. Most portable PCs of this age and type 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 amongst all comparable spec laptops that have been available for a similar time to the UX301LA.
Amongst similar types of portable PC the worst storage medium is HDD.
If you want a portable PC with a better storage medium then you might want to consider the T420s (£1,388.87) (SSD), or the S540 (SSD) both from Lenovo.