The Flex 15 has an HDD storage media which is better than the SSD storage media found on most 2 in 1 laptops that were launched 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.
An HDD storage media is in fact the worst storage medium amongst all portable PCs that have been around for around the same time as the Flex 15.
An SSD storage media is the best storage medium amongst similar types of notebook PC.
If the storage medium of this portable PC is not good enough for you then you might want to look at the Toshiba U920t[plb_1453648_price] (SSD) which also has a higher rating.