The Stream 13-c025na has an SSD storage media which is better than the HDD storage media found on most medium processor cores notebook PCs that have been on the market for around the same time as 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 portable PC's storage medium (SSD) is actually the best storage medium across all medium processor cores notebook PCs that are a similar age to the Stream 13-c025na.
Across comparable types of portable PC the worst storage medium is HDD.