The Transformer Book T200TA has an HDD storage medium which is better than most laptops that came out around the same time as it. Most laptops of a similar spec and age to 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 were launched more than a year ago.
The best storage medium amongst similar types of notebook PC is SSD.