The Asus Transformer Book T200TA has an HDD storage medium which is better than most comparable spec laptops that have been on the market for around the same time as it. Most 2 in 1 laptops that have been on the market for around the same time as it 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 2 in 1 laptops that are a similar age to the Transformer Book T200TA.
The best storage medium across similar types of portable PC is SSD.
If the storage medium of this portable PC is not good enough for you then you might want to look at the Lenovo Yoga (SSD), or the HP Pavilion x360 (£445.14) (SSD).