using strict; I don't think this is a question related to perl at all but anyway..
http://www.roth.net has a good collection of perl scripts and tutorials to leverage WMI to gather information from local or remote machines.
Logical Disk information such as drive letters and mount points is found under the LOGICALDISK WMI class/alias. Like in this shell command..
c:\> WMIC.exe LogicalDisk
Figuring out how to use perl to access WMI remotely should be your task, it's not too hard there's plenty of code that already does it, all that needs doing is tweaking it to do just exactly what you need.
P.S: Also, have a look at the WMI Code Creator and Scriptomatic tools from M$, they have some perl code generators that possibly do just what you need.