Hi @vishalpmehta ,
according to Microsoft representatives, it’s an '''M.2 NVMe SSD'''. But as they said, it’s not removable by “user” and you need to search “skilled technician” to remove it. I don’t know, the time will show.
You can read the full article on the [https://www.pcworld.com/article/3447336/microsoft-wont-upgrade-your-surface-laptop-3s-ssd-at-a-microsoft-store-for-now.html|pcworld.com]