The Stream 11-d070nd has a better storage medium than most medium processor core notebook PCs that came out around the same time as it. This HP portable PC has an SSD storage medium, whereas most portable PCs that are a comparable 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 laptop's storage medium (SSD) is actually the best storage medium amongst all laptops of this type and age.
Amongst comparable types of laptop the worst storage medium is HDD.