The Transformer Book T100TA has a better storage medium than most portable PCs of this age and spec. This Asus laptop has an HDD storage medium, whereas most 2 in 1 laptops that were released 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 across all notebook PCs that have been around for a comparable time to the Transformer Book T100TA.
The best storage medium amongst comparable types of laptop is SSD.
If the storage medium of this portable PC is not good enough for you then you might also want to consider the Lenovo Yoga (SSD), or the HP Pavilion x360 (£382.66) (SSD).