The UX301LA has an SSD storage medium which is better than the HDD storage medium found on most comparable spec notebook PCs that have been available for a similar time 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 laptop's storage medium (SSD) is in fact the best storage medium amongst all laptops that have been around for a similar time to the UX301LA.
Amongst comparable types of laptop the worst storage medium is HDD.
If you want a notebook PC with a better storage medium then you might also want to consider the T420s (£1,388.87) (SSD), or the S540 (SSD) both from Lenovo.