The 13-c002dx has an SSD storage medium which is better than most notebook PCs that came out around the same time as it. Most medium processor core laptops that are a similar age to it have an HDD storage medium. 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.
This portable PC's storage medium (SSD) is actually the best storage medium across all laptops of this spec and age.
The worst storage medium across similar types of portable PC is HDD.