How to use 'updatedb' and 'locate' on a second partition?

[Josef Lowder]

.
When I run 'updatedb' it compiles a list of files only on my primary partition
so I can then use 'locate' to find files I am searching for. 

Is it possible (I assume it is) and how would it be done (what syntax) to use
'updatedb' to build a separate list of files on a second (or third) partition 
so files could be searched for on those partitions?