The Flex 15D has an HDD storage media which is better than most portable PCs of this age and spec. Most comparable spec portable PCs that have been around for a similar time to it have an SSD storage media. 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 portable PC's storage medium (HDD) is in fact the worst storage medium across all similar spec laptops that have been available for more than two years.
An SSD storage media is the best storage medium amongst similar types of portable PC.
If the storage medium of this notebook PC is not good enough for you then you might want to look at the Toshiba U920t[plb_1453648_price] (SSD and higher rated).