The Lenovo Flex has an HDD storage medium which is better than most 2 in 1 laptops that were launched around the same time as it. Most laptops of this spec and age 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 in fact the worst storage medium across all laptops that came out around the same time as the Flex.
Across comparable types of portable PC the best storage medium is SSD.
If you would prefer a notebook PC with a better storage medium then you might want to look at the Lenovo Yoga[plb_2430247_price] (SSD), or the HP Pavilion x360[plb_2404650_price] (SSD).