This laptop has an HDD storage medium, which is typical of many laptops of a similar age and type to 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.
It may also be worth considering one of the other laptops that have an HDD storage media currently available including the Acer Aspire E5-511 which is cheaper.
If you are looking for a notebook PC with a better storage medium then you might want to look at the Fujitsu Lifebook U745 (SSD) which also has a higher rating.