Pretty boring but..
<Firstname>-DT
<Firstname>-LT
I renamed all the computers in the house to follow this naming convention, DT for desktop, LT for laptop.
Servers are called
<My Initials>-AS01
<My Initials>-AS02
And so on, AS being "Application Server"
I've only named my HDDs in my main rig which are as follows:
C: "OS"
D: "DATA"
F: "MISC"
G: "GAMES"