The Radius 11 L15W has an HDD storage medium which is better than the SSD storage medium found on most notebook PCs that came out around the same time as it. HDD is a traditional storage drive which stores the information on magnetic disks. HDD drives are slower than other forms of storage such as solid state drives (SSD) and flash drives.
This notebook PC's storage medium (HDD) is in fact the worst storage medium amongst all laptops of a similar spec and age to the Radius 11 L15W.
The best storage medium amongst similar types of notebook PC is SSD.