Hi,

according to http://www.sqlservercentral.com/articles/Administering/someundocumentedstoredprocedures/400/ it is an undocumented SP.

xp_fixeddrives

This very useful extended stored procedure returns the list of all

fixed hard drives and the amount free space in Mb for each hard drive.

You can find it under Databases -> master -> Programability -> Extended Stored Procedures -> System Extended Stored Procedures