The Stream 13-c025na has an SSD storage medium which is better than most medium processor core notebook PCs that have been on the market for around the same time as it. Most laptops that are a comparable age to it 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 medium processor core notebook PCs that have been on the market for a comparable time to the Stream 13-c025na.
Amongst comparable types of portable PC the worst storage medium is HDD.