I have installed a teamgroup m.2 SSD in my acer aspire A515 51G 59AT some days ago. Then I clonned the c:/ drive and other recovery drives to that and it was working fine untill last day. The last shut down was normal. I just turned off my pc and went to sleep as usual. But in the morning the SSD lost. There is no serial numbers showing in the HDD1 section. It is saying none. Then I tried to unplug the ssd and plugged it again but the problem remains the same. However, I have formatted the previous boot drive, so it is not possible to see the storage management section. I am hopping that it is not a hardware issue!