The Asus Transformer Book T300 Chi has an SSD storage medium which is better than most similar spec notebook PCs that were launched around the same time as it. Most medium processor core laptops that have been on the market for around the same time as it have an HDD storage medium. Solid State Drives (SSD) store data in semiconductors on a circuit board rather than using magnetic or optical media. Solid State Drives have no moving parts which makes them very fast and reliable.
This laptop's storage medium (SSD) is actually the best storage medium amongst all portable PCs of a similar spec and age to the Transformer Book T300 Chi.
The worst storage medium across comparable types of laptop is HDD.
If the storage medium of this laptop is too bad for you then you might want to consider the T420s (SSD), or the S540 (SSD) both from Lenovo.