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Thanks to Manuj Bahl for this:

SQL Server - Extended Stored Procs

SQL Servers has some undocumented extended stored procedures that can be really useful in certain cases.

I was searching google for T-SQL code to find out  free space left on the drives. I not only found that .. but when I looked into the master database ... found out a lot of undocumented stored procs I never knew about. Using this blog to document and serve as a reference later.

xp_getfiledetails

This procedure returns the following information about an existing file.

Alternate Name, Size, Creation Date, Creation Time, Last Written Date, Last Written Time, Last Accessed Date, Last Accessed Time, Attributes

xp_dirtree

This extended stored procedure brings out the directory tree of the drive you pass to it as parameter with depth and Folder name.

xp_fixeddrives

Returns free space in the fixed drives on the server in MB.  

xp_fileexist [, OUTPUT]

Gives the following resultset

File Exists [bit], File Is A Directory [bit], Parent Directory Exists [bit]

xp_enumgroups

Returns the User Groups on the Server

xp_availiblemedia

Free Space on the drives in bytes.

xp_enumdsn

List of DSN configued on the server.