The Asus E402MA has a better storage medium than most many processor cores laptops that have been around for a similar time to it. This portable PC has an SSD storage media, whereas most laptops that were launched around the same time as it have an HDD storage media. Flash drives store data in semiconductors on a circuit board rather than using magnetic or optical media. Flash have no moving parts which makes them very fast and reliable.
An SSD storage media is actually the best storage medium amongst all similar spec notebook PCs that have been on the market for a comparable time to the E402MA.
Amongst similar types of laptop the worst storage medium is HDD.