The Aspire VN7-791G has an HDD storage medium which is better than most portable PCs that were released more than a year ago. Most comparable spec laptops that have been on the market for a similar time to it have an SSD storage medium. 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 actually the worst storage medium amongst all notebook PCs of a similar age and spec to the Aspire VN7-791G.
An SSD storage medium is the best storage medium across comparable types of notebook PC.