First of all there is a way to detect just google it and you will find a lot of code samples (C# or C++).

https://www.google.gr/?gfe_rd=cr&ei=pK6PVpmLLdSz8weTtZeIDg&gws_rd=ssl#q=wmi+ssd+detect

Your question about why i want to know if it is an SSD or HDD does not make sense, if you are scripter you can think why someone want something new to be added, in few words there no why its just an feature.

Need Online mIRC help or an mIRC Scripting Freelancer? -> https://irc.chathub.org <-