The Wyse X90m7 has an SSD storage medium which is better than the HDD storage medium found on most laptops of this age and type. Flash drives store data in semiconductors on a circuit board rather than using magnetic or optical media. Flash have no moving parts which makes them very fast and reliable.
This portable PC's storage medium (SSD) is actually the best storage medium amongst all similar spec laptops that are a comparable age to the X90m7.
Amongst comparable types of portable PC the worst storage medium is HDD.