The Acer Aspire SW5-012 has an HDD storage medium which is better than most notebook PCs of this age and type. Most portable PCs that were released more than two years ago 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.
An HDD storage medium is actually the worst storage medium amongst all laptops of a similar spec and age to the Aspire SW5-012.
The best storage medium across comparable types of portable PC is SSD.