Surface Laptops have on board (soldered) SSD memory from Toshiba.
Mine got THNSN0128GTYA for 128 GB laptop version. Chances are 256/512 GB versions got THNSN0256GTYA or THNSN0512GTYA SSD
If you are interested to know about your Surface's SSD and tweak it for
SSD Wear Level (remaining life),
Benchmark Speed,
Device Temperature,
Over Provisioning,
Performance Tuning etc.
Try this application from Toshiba : SSD Utility
link: https://ssd.toshiba-memory.com/en-amer/download/ssd-utility
Mine got THNSN0128GTYA for 128 GB laptop version. Chances are 256/512 GB versions got THNSN0256GTYA or THNSN0512GTYA SSD
If you are interested to know about your Surface's SSD and tweak it for
SSD Wear Level (remaining life),
Benchmark Speed,
Device Temperature,
Over Provisioning,
Performance Tuning etc.
Try this application from Toshiba : SSD Utility
link: https://ssd.toshiba-memory.com/en-amer/download/ssd-utility